Media playback is unsupported on your device Media caption David Cameron: "There's not going to be a G8 summit this year in Russia" 
 
 The G8 summit will not take place in Russia this year, UK Prime Minister David Cameron has said. 
 
 Speaking in the Netherlands, Mr Cameron said it was "absolutely clear" the planned June meeting of world leaders in the Russian resort of Sochi would not happen owing to events in Ukraine. 
 
 The EU and US have imposed sanctions on Russian officials after Russia's annexation of Crimea from Ukraine. 
 
 Moscow has also been warned of further action if it does not change course. 
 
 The announcement that the Sochi meeting had been effectively cancelled came after Russian troops seized control of the last major military base in Crimea. 
 
 Mr Cameron, US President Barack Obama and other G8 leaders are attending a nuclear co-operation summit in The Hague, to which Russian President Vladimir Putin was not invited. 
 
 'Illegal annexation' 
 
 "We should be clear there's not going to be a G8 summit in Russia," Mr Cameron said, urging Russia to "change course". 
 
 The G7 leaders plus EU representatives issued a declaration after their meeting in The Hague noting that "international law prohibits the acquisition of part or all of another state's territory through coercion or force". 
 
 Image copyright AFP 
 
 "To do so violates the principles upon which the international system is built," they said. 
 
 "We condemn the illegal referendum held in Crimea in violation of Ukraine's constitution. We also strongly condemn Russia's illegal attempt to annex Crimea in contravention of international law and specific international obligations. We do not recognise either." 
 
 Russia's actions would have "significant consequences", they continued. 
 
 "We remain ready to intensify actions including coordinated sectoral sanctions that will have an increasingly significant impact on the Russian economy, if Russia continues to escalate this situation. 
 
 "Russia has a clear choice to make. Diplomatic avenues to de-escalate the situation remain open, and we encourage the Russian government to take them." 
 
 UK Foreign Secretary William Hague said there was an increasing recognition that European leaders wanted to stop relying so heavily on Russian oil and gas. 
 
 The G7 had to be prepared to take more far-reaching measures in response to the developments, he said. 
 
 The UK and other G8 nations suspended their preparations for the Sochi summit last month as the crisis in Ukraine intensified and hinted that they could meet without Russia. 
 
 Several G8 members have also called for Russia's membership of the powerful body to be suspended. 
 
 The BBC's Europe correspondent Matthew Price said the end of the Sochi summit was a recognition of Russia's isolation on the global stage as a result of what it had done in Ukraine. 
 
 The US, UK and other countries, he added, were making clear they did not want Russia "in their club" unless it reconsidered its actions in Crimea. ||||| Media playback is unsupported on your device Media caption William Hague: "The sovereignty and territorial integrity of Ukraine has been violated" 
 
 The UK has pulled out of preparatory talks for the G8 summit because of Russia's build-up of troops in the Ukrainian region of Crimea. 
 
 The summit is due to be hosted by Russia in the city of Sochi. 
 
 Prince Edward, patron of the British Paralympic Association, has cancelled a visit to Russia for the Paralympic Games in Sochi, on government advice. 
 
 Downing Street said David Cameron and Barack Obama had spoken and agreed that Russia's actions were "unacceptable". 
 
 A spokesman said: "The prime minister and President Obama spoke at 9pm tonight [Sunday]. 
 
 "They agreed that Russia's actions were completely unacceptable. They agreed on the urgent need for de-escalation and for Russia to engage in a dialogue directly with Ukraine. 
 
 "They agreed there must be 'significant costs' to Russia if it did not change course on Ukraine." 
 
 The spokesman said Mr Cameron was also speaking to Polish Prime Minister Donald Tusk and Lithuanian President Dalia Grybauskaite on Sunday evening. 
 
 Mr Cameron said British ministers would also now not attend the Paralympic Games. 
 
 British Paralympic Association chief executive Tim Hollingsworth told BBC Sport: "We completely understand the decisions that have been taken that mean UK ministers and His Royal Highness The Prince Edward will not attend the Sochi Paralympic Games. 
 
 "We are grateful for their continued full support for the British team to compete in Sochi. That remains our prime focus, the team are all in Sochi as of tomorrow [Monday] and training hard." 
 
 A Downing Street spokesman said Mr Cameron remained "fully supportive of our Paralympic athletes' participation at Sochi". 
 
 Earlier, Foreign Secretary William Hague flew to Kiev for talks with Ukraine's new leaders, amid rising tension with Russia. 
 
 Ukrainian acting president Olexander Turchynov has ordered a full mobilisation of Ukrainian military forces. 
 
 Mr Hague has said he will reiterate UK support for Ukraine's sovereignty. 
 
 The West has responded to the Ukraine crisis with frenetic diplomatic activity. But beyond strong words of condemnation, real pressure on Moscow appears muted. William Hague said his overwhelming priority was to calm tensions. He urged Russia to speak directly to the Ukrainians. In terms of sanctions, he said Britain and others would suspend preparatory meetings of the G8 summit in June. Mr Hague seemed to want to appear even-handed. He also had a firm message for the Kiev government - calling on them not to respond to provocation and to protect the Russian speaking minorities to avoid any pretext for Russia to expand its military ambitions. It looks doubtful there are any more forceful options which the West would be prepared to use to loosen Russia's hold on Crimea. NATO has no legally binding alliance with Ukraine. So even though its secretary general said today that Russia's actions were threatening peace and security in Europe, military intervention is not on the cards. 
 
 Before leaving for Kiev, Mr Hague said: "We have to recognise the sovereignty and the territorial integrity of Ukraine has been violated and this cannot be the way to conduct international affairs. 
 
 "And so, in addition to calling yesterday's emergency meeting of the UN Security Council, the United Kingdom will join other G8 countries this week in suspending our co-operation under the G8, which Russia chairs this year, including the meetings this week for the preparation of the G8 summit." 
 
 He said Britain would keep its approach to further G8 meetings under review. 
 
 In Brussels, Nato held emergency talks about Russia's move to take control of Crimea. 
 
 Just before the meeting, Nato secretary-general Anders Fogh Rasmussen said Russia's troop deployments violated the principles of the United Nations charter and threatened peace and security in Europe. 
 
 "Russia must stop its military activities and its threats," he said. 
 
 Image copyright PA Image caption British-based Ukrainians staged a protest outside Russia's embassy in London 
 
 Image copyright PA Image caption The protest was occasionally noisy but remained peaceful 
 
 Image copyright PA Image caption Some protesters aimed their criticism at President Putin personally 
 
 Image caption Many also gathered near the Ukrainian embassy 
 
 Image caption They congregated around a statue of St Volodymyr , who is credited with introducing Ukraine to Christianity 
 
 The Ukrainian government has said it will seek the help of US and UK leaders to guarantee its security. 
 
 The interim prime minister, Arseniy Yatsenyuk, said Russia's military moves amounted to a "declaration of war". 
 
 Crimea key facts Autonomous republic within Ukraine 
 
 Most residents speak Russian and identify as ethnic Russians 
 
 Some others are anti-Russian 
 
 Russia leases naval base in Crimean city of Sevastopol 
 
 Moscow has deployed its troops outside the base and sent extra troops from Russia Why Crimea is so dangerous 
 
 On Saturday, President Obama held a 90-minute telephone conversation with Russian President Vladimir Putin and urged him to pull his forces back to bases in Crimea. 
 
 Mr Putin says Russia reserves the right to protect its interests and those of Russian speakers in Ukraine. 
 
 The Foreign Office says Mr Hague will make clear the UK's support for Ukraine's new government, which was formed after the ousting of former president Viktor Yanukovych in a popular uprising last month. 
 
 His removal from power followed four months of street protests that culminated in bloody clashes between demonstrators and security forces. 
 
 On Saturday, Mr Hague said the UK would work with international partners to "ensure that reforms by Ukraine are matched by international willingness to provide economic support". 
 
 From the scene: An expat's view David* is a British citizen living with his Ukrainian wife and three-year-old daughter in Simferopol, Crimea. It would appear that trains are no longer running, so our only option is a flight out, now that the airspace has been reopened. It is clear that any foreign citizen must remain at home. Apparently an American man was severely beaten only yesterday, without any real provocation. From our perspective, it is clear that Russian authorities are firmly in control here. We can only pray that Ukrainian forces do not rise to the provocation and begin a conflict, despite the injury to the integrity of the country. We would urge William Hague to push this point home to them. The news that reserve forces have been called up is therefore deeply discouraging. * David is not his real name. He spoke to the BBC on condition of anonymity 
 
 He said Britain would also help Ukraine recover corruptly acquired assets. 
 
 BBC world affairs correspondent Emily Buchanan said Mr Hague was likely to urge the Ukrainian government not to do anything to provoke Russia, in order not to give Moscow a pretext for further military action. 
 
 Mr Hague said it was also important that Russia spoke to the Ukrainian authorities directly. 
 
 Russia, which rejects the legitimacy of Ukraine's new leaders, has so far refused to do so. 
 
 Former Conservative foreign secretary Sir Malcolm Rifkind said the situation was the "most serious crisis since the end of the Cold War". 
 
 "This needs to be a defining moment and Putin needs to understand this... in the West's relationship with Russia," he said. 
 
 A former British ambassador to Moscow, Sir Tony Brenton, said Mr Hague must "damp down" the tension between Russia and Ukraine. 
 
 He said: "[President Putin] has just seen his man, in effect, [Viktor] Yanukovych, overthrown by what he sees as a Western instigated revolt. He [Putin] is determined to maintain Russian influence in Ukraine as a whole, and he has now taken Crimea... hostage." 
 
 Media playback is unsupported on your device Media caption Former British ambassador to Moscow, Sir Tony Brenton, says Crimea has been "taken hostage" by President Putin 
 
 Labour leader Ed Miliband said there could be "no justification" for Russian military action in Ukraine. 
 
 "I believe diplomatic and economic pressure we can put on Russia is the best hope we can have for what everyone wants to see, which is the de-escalation of this crisis," he said. 
 
 In London, hundreds of Ukrainians staged two protests, one near the Russian embassy and the other at the Ukrainian embassy. 
 
 The demonstrators chanted slogans and held up banners that said "Hands off Ukraine". Similar protests were held in other European capitals. 
 
 The Foreign Office is advising against all travel to Crimea, and urging British nationals in Crimea to leave. 
 
 It said train and bus routes out of the peninsula were still operating, but it did not advise British nationals to try to leave by air from Simferopol until the situation had become more stable. ||||| (CNN) -- Cheers in Moscow. Outrage in Kiev. Bloodshed in Simferopol. 
 
 Tuesday saw Russian President Vladimir Putin announce the annexation of Crimea, two days after voters in that semiautonomous territory approved a hastily called referendum on separating from Ukraine. 
 
 Putin told a joint session of Russia's Parliament that the nearly 97% of Crimean residents who voted to join Russia over the weekend was "an extremely convincing figure." 
 
 "In our hearts, we know Crimea has always been an inalienable part of Russia," he said. 
 
 Ukrainian Prime Minister Arseniy Yatsenyuk called it "a robbery on an international scale," one that Kiev will never accept. 
 
 "One country has come and temporarily stolen part of of the territory of an independent country," he said. "It will be difficult to find a quick resolution to this problem, but Russia is now isolated by the whole international community." 
 
 And after a member of its military was killed, another wounded and more captured when masked gunmen seized their base near the Crimean regional capital, Simferopol, Ukraine's defense ministry authorized its forces to open fire. 
 
 Yatsenyuk warned that the crisis was shifting "from political to the military form, and the blame is on the Russian military." 
 
 Crimea, which has an ethnic Russian majority, has long been a semiautonomous region within Ukraine. It has had its own Parliament, but the Ukrainian government had veto power over its actions. 
 
 After the revolt that forced pro-Russian President Viktor Yanukovych from office in February, Russian troops poured into the Crimean Peninsula, effectively cutting it off in support of a pro-Russian government that took power in Simferopol. 
 
 Putin said Tuesday that Russia had to act as Ukraine's new government, backed by the United States and European powers, prepared "to seize the state through terror and murders." 
 
 "The main executors of this were nationalists, Russia-phobes and anti-Semites," he said. "Those people define what is happening today in Ukraine." 
 
 But international observers have said Moscow saw its chance to annex a strategic territory, one that was transferred to Ukraine in the Soviet era and which still hosts the home port of Russia's Black Sea Fleet. 
 
 Ukraine's interim President, Oleksandr Turchynov, told reporters that Putin is "mimicking the fascists of the last century" by annexing Crimea. 
 
 "The political leadership of Russia will have to answer before the whole world for crimes they are committing today in our country," Turchynov said. 
 
 Cameron: Annexation sends 'a chilling message' 
 
 Putin declared Tuesday that "We have not used our armed forces in Crimea," despite what has been stated by international observers and the government of Kiev. He said the 22,000 Russian troops in Crimea did not enter during the current crisis, but "were already there," in accordance with previous international negotiations. 
 
 Russian forces were allowed in Crimea under a treaty that allowed the Black Sea Fleet to be based there, but the movements of its forces within Crimea are supposed to be agreed upon with Kiev. 
 
 Putin praised those forces for avoiding bloodshed, but the tensions appear to have boiled over into violence Tuesday. 
 
 Masked gunmen killed a member of Ukraine's military, wounded another and arrested the remaining staff of Ukraine's military topographic and navigation directorate at Simferopol, Defense Ministry spokesman Vladislav Seleznyov told CNN. 
 
 After that, the Defense Ministry authorized its forces in Crimea to use weapons "to protect and preserve the life of Ukrainian soldiers," according to a statement posted on its website. 
 
 Petro Poroshenko, a Ukrainian member of Parliament and former foreign minister, said Tuesday that his country stands at "the beginning of a very dangerous conflict, and we should do our best to stop this process." 
 
 "Several weeks ago, we had a guarantee that nothing [would] happen with the Crimea. Several weeks ago we had [a situation] that there is not any military presence on Ukrainian territory, including the Crimea," he told CNN's "Amanpour " program. Now, he said, "I strongly believe that this is not only Ukrainian territory is now threatened." 
 
 "Now under attack can be any country in the European Union, including other parts of Ukraine," said Poroshenko, a billionaire and leading potential candidate for president. "That's why we should think that it can never happen again." 
 
 U.S. and EU officials imposed sanctions on more than two dozen Russian and Crimean officials Monday and have urged Russia to avoid escalating the crisis, but Moscow has ignored those calls. 
 
 Tuesday's annexation brought a new round of condemnation from the West, with British Prime Minister David Cameron saying it sends "a chilling message across the continent of Europe." 
 
 "It is completely unacceptable for Russia to use force to change borders, on the basis of a sham referendum held at the barrel of a Russian gun," Cameron said in a statement issued by Downing Street. "President Putin should be in no doubt that Russia will face more serious consequences, and I will push European leaders to agree further EU measures when we meet on Thursday." 
 
 Russia faces 'more than just sanctions,' Biden says 
 
 The G7 group of industrialized nations had already suspended preparations for a planned G8 summit in the Russian city of Sochi. Now, U.S. President Barack Obama has invited his counterparts from the other G7 countries and the European Union to a meeting of next week on the margins of a nuclear security summit in The Hague, U.S. National Security Council spokeswoman Caitlin Hayden said. 
 
 The planned meeting comes amid speculation that Russia will get kicked out of the G8 -- which comprises the G7 countries plus Russia -- because of its actions in Crimea. 
 
 In Washington, U.S. Secretary of State John Kerry criticized "this rise of a kind of nationalism that is exercised unilaterally, to the exclusion of the international legal process." 
 
 "That's what we have worked hard to avoid ever since World War II," Kerry said. He acknowledged that Russia has interests in Crimea and "an enormous historical connection to Ukraine," but said he was "really struck and somewhat surprised and even disappointed" by Putin's case for annexing the territory. 
 
 "With all due respect, it just didn't (jibe) with reality or what's happening on the ground," Kerry said. "The President may have his version of history, but I believe that he and Russia, for what they have done, are on the wrong side of history." 
 
 German Chancellor Angela Merkel has said the "so-called referendum" and the acceptance of Crimea to the Russian Federation "goes against international law," while French Foreign Minister Laurent Fabius and a French delegation have postponed a planned visit to Moscow because of the Ukrainian situation, the Russian Foreign Ministry said. 
 
 And U.S. Vice President Joe Biden, dispatched to reassure NATO allies in Eastern Europe, said Russia faces "more than just sanctions" unless it abandons its "land grab" in Crimea. 
 
 "We're talking about Russia putting itself on a path that undermines long-term confidence and creates obstacles for its full participation in the global economy," Biden said after talks in Poland's capital, Warsaw. "That path that they've placed themselves on does nothing to help the next generation of Russians compete and succeed in a world that will be led by the most dynamic and open economies." 
 
 Condemnation abroad, cheers at home 
 
 But lawmakers in Moscow met Putin's address with regular and enthusiastic applause. The Russian leader accused the West of "double standards" and cynicism in its response to the Crimean crisis, citing Kosovo -- which split from Russia's historical ally Serbia over fierce objections from Belgrade -- as a precedent. 
 
 "It's absolutely in favor of their own interests -- black today, white tomorrow," he said. 
 
 Russia's Parliament is expected to vote on ratifying Crimea's accession to the Russian Federation by the end of the week. The speaker of Russia's upper house of Parliament, Valentina Matvineko, told state-run Russia-24 TV that the process of adding a new member to the Russian Federation "can be done rather promptly." 
 
 And hours after the annexation announcement, Putin appeared at a huge celebration on Red Square organized by his supporters -- a sign of his widespread popularity at home. An opinion poll by the Moscow-based Levada Center puts his approval rating at 72% -- the highest in more than three years, and the second-highest point of his presidency. The highest point came in 2008, during Russia's conflict with Georgia, another former Soviet republic. 
 
 "Putin in many senses, on many levels, crystallizes the Russian national consciousness," biographer Alexander Korobko told CNN. "For the past 100 years perhaps, we have never had a leader who would appeal to the Russian soul ... as much as Putin." 
 
 Most Russians and Crimeans feel Crimea "is coming back home," and a country that can produce "pretty much anything" has little fear of sanctions, he said. 
 
 "It is absolutely not in the U.S. interest to impose sanctions on Russia, because who will take American astronauts to space if not us Russians?" Korobko asked. 
 
 Crimea's vote: Was it legal? 
 
 Opinion: Obama can't have it both ways on Crimea 
 
 West's sanctions on Russia: Are they just for show? 
 
 Opinion: Putin won't stop at Crimea 
 
 CNN's Alla Eshchenko reported from Moscow and Matt Smith wrote in Atlanta. CNN's Laura Smith-Spark, Frederik Pleitgen, Nick Paton Walsh, Elena Sandreyev and Mick Krever contributed to this report.
– The other seven members of the G8 are calling off the meeting Russia was supposed to host in Sochi in June, David Cameron revealed today. Cameron, President Obama, and the other leaders of the G7 nations—which is to say the G8 minus Russia—are holding an emergency meeting at the Hague today, on the sidelines of a nuclear summit. "There's not going to be a G8 summit in Russia," Cameron said, according to the BBC. "That's absolutely clear. … Frankly, it is Russia that needs to change course." If Russia doesn't change, the nations have hinted that more sanctions could be on the way—and that could be bad news for Russia. Some banks are predicting that the sanctions already have Russia headed toward recession. The Russian bank SMP has seen $258 million withdrawn since the US sanctioned it, according to Voice of America. Ordinary Russians feel it is they, not Vladimir Putin or his inner circle, who will be hurt most, USA Today reports. But the US might have a secret weapon; Bloomberg has a fascinating piece on a Russian billionaire currently being detained on a US warrant who might fork over crucial information on Gazprom that could really hurt Putin's inner circle.