In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

Media playback is unsupported on your device Media caption "Police are pulling people out at random" - BBC reporter at the scene 
  
 Hundreds of people have been detained at anti-corruption rallies in Moscow and St Petersburg. 
  
 Riot police in central Moscow were picking protesters out of the crowd at random, a BBC correspondent at the demonstration has said. 
  
 Opposition leader Alexei Navalny was detained at his home ahead of the protests, according to his wife. 
  
 Thousands of supporters have heeded his call to take to the streets of Moscow and other Russian cities. 
  
 OVD-Info, an independent NGO, told Russian media that 600 people had been detained at the Moscow protest. 
  
 Police in Moscow say about 5,000 took part in the demonstration there, Interfax news agency reports. 
  
 Russia's interior ministry says that about 3,500 people attended the protest in St Petersburg, and 500 were detained. 
  
 Image copyright AFP Image caption Young people were detained at the protest in St Petersburg 
  
 "Alexei [Navalny] has been arrested in the entrance to our block of flats," Yuliya Navalnaya wrote on Twitter, ahead of the demonstration. 
  
 Mr Navalny, who intends to stand for the Russian presidency next year, had been due to attend the unauthorised rally in central Moscow. 
  
 'Many young plucked from the crowd' - by BBC's Sarah Rainsford, central Moscow 
  
 Image copyright EPA 
  
 This was a peculiar protest. 
  
 At first it was hard to tell who was taking part. Tverskaya Street was full of families marking Russia Day with entertainers in historical costumes. 
  
 Then thousands of protesters turned up. Huge numbers of riot police were right behind them. 
  
 First they announced that the rally was illegal then the arrests began. We saw dozens of people plucked from the crowd - many of them young - and dragged roughly towards police buses. 
  
 By calling people to an unauthorised rally, Alexei Navalny knew he was risking a confrontation. The police duly obliged. 
  
 But people I spoke to said they knew the risk and still wanted their voices to be heard. Among other things, those voices chanted loudly: "Putin, thief!" and "Russia will be free". 
  
 In a live broadcast by the Russian liberal TV channel, Dozhd, protesters in St Petersburg could be heard shouting "shame" as they were detained by police. Among those arrested was Maxim Reznik, the city's legislative assembly deputy. 
  
 Prominent activist Daniil Ken said he was arrested as he left his home in St Petersburg. He urged people to join the rally at the city's Champ de Mars square. "Go for me, please!" he tweeted. He has since been released. 
  
 Police had earlier detained several people at demonstrations in the cities of Vladivostok, Blagoveshchensk and Kazan. 
  
 What are the protests about? 
  
 Mr Navalny called on Russians to take to the streets on Monday - Russia Day - to express their anger at alleged corruption at the highest levels. 
  
 The anti-corruption campaigner uses YouTube, tweets and blogs to reach new audiences. 
  
 A video posted in March accuses Russian Prime Minister Dmitry Medvedev of accumulating a vast private fortune. Mr Medvedev denies the claims. The video, which includes the accusation that the PM has a duck house on one of his properties, has been viewed nearly 23 million times. 
  
 In a call for people to join him on Monday, Mr Navalny wrote: "I want changes. I want to live in a modern democratic state and I want our taxes to be converted into roads, schools and hospitals, not into yachts, palaces and vineyards." 
  
 Mr Navalny was earlier granted permission to hold a rally at Sakharova Avenue but changed the location - without permission - on the eve of the demonstration to Tverskaya Street, near the Kremlin. 
  
 The protest was called over government plans to demolish Soviet-era apartment blocks in the city. 
  
 Image copyright EPA Image caption This woman draped herself in the colours of the Russian flag 
  
 Permission was granted for demonstrations in 169 locations across the country, some of which were broadcast live on the Navalny Live YouTube channel. 
  
 The protests coincided with a series of official events - including festivals, concerts and military enactments - taking place across the country to mark Russia Day, the national holiday dedicated to the 1990 declaration of sovereignty. 
  
 Similar rallies led by Mr Navalny in March led to hundreds of arrests. 
  
 Those protests were the largest since 2012, drawing thousands of people - including many teenagers - to rallies nationwide, angered by a report published by Mr Navalny that accused Prime Minister Dmitry Medvedev of corruption. 
  
 Are you at or planning to attend the protest? Share your views and experiences by emailing haveyoursay@bbc.co.uk. 
  
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 Embed Police Arrest Anti-Putin Protesters in Russia 3:21 autoplay autoplay Copy this code to your website or blog 
  
 MOSCOW — Thousands of Russians protested against corruption on Monday, part of opposition leader Alexei Navalny's long-shot drive to unseat President Vladimir Putin at the ballot box next year. 
  
 Navalny is aiming to repeat the nationwide protests that rattled the Kremlin three months ago. However, he was arrested while on his way to a rally in Moscow, according to his wife. 
  
 The opposition leader was later sentenced to 30 days in jail, his spokeswoman Kira Yarmysh said on Twitter. 
  
 Russian opposition leader Alexei Navalny attends a court hearing in Moscow on May 30. Sergei Ilnitsky / EPA file 
  
 Navalny later said in a tweet, "They stole everything in the country, and moreover, I will mess a Depeche Mode show in Moscow because of them." 
  
 30 суток. Мало того, что они всю страну разворовали, так я ещё из-за них концерт Depeche Mode в Москве пропущу. — Alexey Navalny (@navalny) June 12, 2017 
  
 The English electronic rock band from the 1980s is on a world tour and playing Moscow on July 15. 
  
 The scale and geographical reach of the protests could show if Navalny can build on the success of demonstrations in March calling for Prime Minister Dmitry Medvedev, a close Putin ally, to quit. 
  
 Those protests were the largest since a wave of anti-Kremlin rallies in 2012 and resulted in more than 1,000 arrests, putting rare domestic pressure on Putin. 
  
 Monday is Russia Day, a public holiday, a factor that may boost turnout. There were men dressed in medieval armor with fur hats and swords. There were replicas of ancient wooden catapults and children were posing for pictures with the actors dressed in period costumes. 
  
 Gallery: Police Arrest Over 1,000 in Russia Corruption Protests 
  
 As the number of demonstrators grew, and some began chanting — "Putin is a Thief," "Russia Without Putin," and "We Love Russia," —hundreds, if not thousands, of police arrived. They interlocked their arms and batons and marched into the line of demonstrators. 
  
 Some of the protesters pushed back against the advance. Within half an hour, both the number of protesters and police swelled further. Then, police started to make detentions, grabbing protesters, picking them off their feet. The police then moved to cut the crowds into sections, a common tactic, moving behind the lines of demonstrators to pen them in. 
  
 Police detain an opposition protester In Moscow on Monday. Evgeny Feldman / Pool via AP 
  
 Navalny's website reported Monday that protests were held in more than a half-dozen cities in the Far East, including the major Pacific ports of Vladivostok and Khabarovsk and in Siberia's Barnaul. Photos on the website suggested turnouts of hundreds at the rallies. 
  
 Eleven demonstrators were arrested in Vladivostok, according to OVD-Info, a website that monitors political repressions. 
  
 Navalny's wife later posted on Twitter that the opposition leader had been arrested outside his Moscow home on his way to the main demonstration in the capital. 
  
 Alexei Navalny is detained outside his home in Moscow on Monday. Yulia Navalny via Twitter 
  
 Police later confirmed the arrest, originally saying he could get only up to 15 days in jail on charges of failing to follow police orders and violating public order. 
  
 Moscow authorities had agreed to a location for a protest rally in the capital, but Navalny at the last minute called for changing it to one of the city's main thoroughfares, citing interference in building a stage at the agreed-upon rally site. 
  
 Switching the venue meant the protest was be illegal in the authorities' eyes and that riot police could potentially be ordered to move in to break it up. 
  
 Related: Why Russian Protesters Are Taunting PM With Bath Toys 
  
 For now, polls suggest Navalny, who was jailed for 15 days for disobeying a police officer at the last protest, has scant chance of unseating Putin, who enjoys high ratings. It remains unclear too whether the Kremlin will let Navalny run for the presidency. 
  
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 Embed FROM MARCh 27: Russian Opposition Leader Jailed Following Protests 0:42 autoplay autoplay Copy this code to your website or blog 
  
 But the 41-year-old lawyer turned political street campaigner hopes anger over corruption may boost his support. 
  
 A video he made accusing Medvedev of owning a giant estate and of living far beyond his means has garnered over 22 million online views to date. 
  
 Related: Average Russian Bribe Jumps 75 Percent in a Year, Official Says 
  
 Medvedev dismissed Navalny's allegations as politically motivated "nonsense." 
  
 In April, Navalny suffered damage to one eye after an attacker doused his face with a green antiseptic liquid. 
  
 Opposition protestors chant as they are blocked by riot police in Moscow on Monday. Alexander Zemlianichenko / AP 
  
 "I want changes," Navalny wrote. "I want to live in a modern democratic state and I want our taxes to be converted into roads, schools and hospitals, not into yachts, palaces and vineyards." 
  
 The Kremlin has long sought to cast the opposition as a phenomenon of a privileged, Westernized urban elite out of touch with people in Russia's far-flung regions. 
  
 Monday's protests could demonstrate that the opposition has significant support throughout the vast country. ||||| Russian police officers talk as they stand behind barricades in downtown Moscow, Russia, Monday, June 12, 2017. Russian opposition leader Alexei Navalny, aiming to repeat the nationwide protests that... (Associated Press) 
  
 MOSCOW (AP) — Protests spearheaded by prominent opposition figure Alexei Navalny were taking place across the country on Monday, but Navalny himself was reportedly arrested outside his Moscow home en route to the centerpiece demonstration in the capital city. 
  
 Navalny's wife, Yulia, said on his Twitter feed that he was arrested about a half-hour before the demonstration was to begin. There was no immediate statement from police. 
  
 Although city authorities had agreed to a location for the Moscow protest, Navalny called for it to be moved to Tverskaya Street, one of Moscow's main thoroughfares. He said contractors hired to build a stage at the agreed-upon venue could not do their work after apparently coming under official pressure. 
  
 Tverskaya, known in Soviet times as Gorky Street, was closed off to traffic on Monday for an extensive commemoration of the national holiday Russia Day, including people dressed in historical Russian costumes. 
  
 After the change, Moscow police warned that "any provocative actions from the protesters' side will be considered a threat to public order and will be immediately suppressed." 
  
 A regional security official, Vladimir Chernikov, told Ekho Moskvy radio that police would not interfere with demonstrators on the street — as long as they did not carry placards or shout slogans. 
  
 More than 1,000 protesters were arrested at a similar rally March 26. 
  
 The protests in March took place in scores of cities across the country, the largest show of discontent in years and a challenge to President Vladimir Putin's dominance of the country. 
  
 The Kremlin has long sought to cast the opposition as a phenomenon of a privileged, Westernized urban elite out of touch with people in Russia's far-flung regions. But Monday's protests could demonstrate that it has significant support throughout the vast country. 
  
 Navalny's website reported Monday that protests were held in more than a half-dozen cities in the Far East, including the major Pacific ports of Vladivostok and Khabarovsk and in Siberia's Barnaul. Photos on the website suggested turnouts of hundreds at the rallies. 
  
 Eleven demonstrators were arrested in Vladivostok, according to OVD-Info, a website that monitors political repressions. 
  
 Navalny has become the most prominent figure in an opposition that has been troubled by factional disputes. He focuses on corruption issues and has attracted a wide following through savvy use of internet video. His report on alleged corruption connected to Prime Minister Dmitry Medvedev was the focus of the March protests. 
  
 Navalny has announced his candidacy for the presidential election in 2018. He was jailed for 15 days after the March protests. In April, he suffered damage to one eye after an attacker doused his face with a green antiseptic liquid. |||||
As tens of thousands protest corruption throughout Russia on Monday, prominent opposition figure Alexei Navalny is not among them. Navalny was reportedly arrested 30 minutes before things were set to kick off in Moscow, with wife Yulia tweeting, "Alexei has been arrested in the entrance to our block of flats," but "our plans haven't changed," per the BBC. That will make for one fewer protester on a day when NBC News suggests numbers count: The "scale and geographical reach" will indicate whether Navalny was able to successfully grow protests held in March that saw more than 1,000 people arrested. Those protests—spurred by Navalny's charges that Prime Minister Dmitry Medvedev had enriched himself with $1 billion worth of mansions, yachts, and vineyards, reports the Washington Post—were the largest in roughly five years. NBC News notes one favorable condition as far as turnout goes: Monday is Russia Day, a public holiday. The Post sees the protests as a sort of bellwether for Navalny, who wants to take the presidency from Vladimir Putin in 2018 (though Navalny has technically been disqualified as a candidate). As for why Navalny was arrested, Moscow's general prosecutor indicated it was over his "illegal" last-minute call to change the protest location in that city from the approved spot, where plans to erect a stage were apparently scuttled, to Tverskaya Street near the Kremlin. After the venue-change announcement, the AP reports Moscow police warned "any provocative actions from the protesters' side will be considered a threat to public order and will be immediately suppressed." (Navalny was partially blinded by toxic green dye in April.)