Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: A visit by international nuclear inspectors to Iran ended in failure Tuesday. Tehran not only blocked access to a site the inspectors believe could have been used for tests on how to produce a nuclear weapon, they reported, but it also refused to agree to a process for resolving questions about other “possible military dimensions” to its nuclear program. 
  
 The announcement came in a terse press release from the International Atomic Energy Agency, a United Nations agency, which said its inspection team had left the country. The agency is expected to release its latest report on the status of Iran’s program in the next week. 
  
 The inspectors’ previous visit to Iran ended several weeks ago with no agreement other than to meet this week. 
  
 Iran’s refusal to deal with the inspectors’ questions is likely to increase tension, at a moment of heightened sanctions and after the assassination of nuclear scientists in Iran and suspected retaliation against Israeli diplomats. Iran struck an increasingly bellicose tone on Tuesday, with an Iranian official warning that the country would take pre-emptive action against perceived foes if it felt its national interests were threatened. The country also laid down new conditions for oil sales. 
  
 Advertisement Continue reading the main story 
  
 Iran also indicated in recent days, however, that it was willing to resume negotiations over its nuclear program, but it was unclear under what terms. ||||| CAIRO — China, Russia and Iran all made declarations of support for the Syrian government on Tuesday, reaffirming their alliances in the face of broad, intense international lobbying for unity against President Bashar al-Assad as his nearly yearlong crackdown on domestic opponents has sharpened against restive areas. 
  
 The worst violence on Tuesday was reported in the central city of Homs, which has been under sustained assault for more than two weeks. The day’s toll of that city’s residents, as compiled by various groups that try to track the violence from inside and outside the country, ranged from 16 to more than 40 killed. At the same time, the faction of the opposition that is armed has claimed several more lives, according to the Syrian government, whose news agency reported the funerals of three soldiers killed in or near Damascus and in the city of Hama, to the north. 
  
 Russia announced that it would not participate in a meeting in Tunisia on Friday of a contact group of Western and Arab nations, Friends of Syria, where opposition figures were expected to lobby for greater international recognition and support. The Syrian government’s news agency, SANA, reported that a Chinese special envoy to the Middle East, Wu Sike, visited Damascus on Tuesday and called for dialogue with all sides in the crisis. SANA also reported from Beijing on a news conference by the Chinese foreign ministry spokesman, Hong Li, in which he called for “the international community to respect the sovereignty, stability and unity of Syria.” 
  
 Mr. Li did not say whether China would attend the Friends of Syria conference. 
  
 Iranian officials, at a regular foreign ministry news conference in Tehran, did not explicitly discuss the conference, but denounced Western meddling in the affairs of its longstanding ally as benefiting Israel at the expense of those who resist its power. “What is happening in Syria serves the best interests of Israel and weakens the resistance,” said a ministry spokesman, Ramin Mehmanparast, as quoted by SANA. 
  
 But the United States threw some of the Iranian’s support for Syria into question, suggesting that Iran’s reports that it has sent two warships to help train Syrian forces were false. “We have absolutely no indication whatsoever the Iranian ships ever docked in Syrian ports,” a Pentagon spokesman, George Little, was quoted by Reuters as saying. 
  
 Iran’s Press TV satellite broadcaster had said the two ships, a destroyer and a supply ship, docked in Tartus on Saturday “to provide maritime training to naval forces of Syria under an agreement signed between Tehran and Damascus a year ago.” 
  
 Red Cross officials did not respond to calls on Tuesday seeking to establish whether the organization’s efforts to secure even a brief ceasefire from government forces had been successful. But based on reports from activist groups and official Syrian media, the violence appeared unabated. Foreign journalists are generally not allowed in Syria, so such reports cannot be verified. 
  
 The assault on Homs appeared to be a continuation of the government attack on the city that began Feb. 4, after China and Russia vetoed a resolution condemning the violence and backing an Arab League plan for Mr. Assad to step aside. (Last week, in the strongest international rebuke to date, the General Assembly voted overwhelmingly to pass the same resolution in nonbinding form.) 
  
 A new Cairo-based group, the Activist News Association, has been collecting information from a network of “citizen journalist” contacts inside of Syria. Rami Jarrah, a Syrian activist who helped create the group, said that Syrian government and ground forces were massing outside of Homs. “Active resistance has long since stopped but the government is using the excuse of ‘armed resistance’, in quotes, to continue this bombardment,” Mr. Jarrah said. “They’re killing the democratic movement.” 
  
 Based on photographs of victims sent from inside Syria, he said, at least 79 deaths took place around the country on Tuesday, 46 of them in Homs, where shelling of the Sunni Arab neighborhood of Baba Amr was particularly heavy, and 33 in Idlib to the north. That toll was likely to rise, he said. 
  
 Another exile activist group, the Syrian Observatory for Human Rights, reported that in the northern city of Aleppo, unknown gunmen shot and killed Mohammad Ramadan, a businessman who supported the government. It also reported scattered protests and skirmishing in the capital, Damascus, where a group of youths raised an opposition flag at the Al-Jaawzeh Bridge at the southern entrance of the capital, the London-based Observatory said. 
  
 Meanwhile, the Hamas authorities in the Gaza Strip allowed Palestinians to demonstrate against Mr. Assad for the first time, a move that came weeks after the top Hamas leadership abandoned its longtime base in Damascus. The unusual rally was organized by a group called the Palestinian Gathering to Support Syrian People, a new body run by the sons of late Hamas leaders from Gaza. 
  
 About 200 students rallied at Islamic University before marching with Palestinian and Syrian flags to downtown Gaza. There, some 100 more Palestinians joined the rally, including women. The protesters burned posters of Mr. Assad and carried banners bearing slogans like “Allah, Syria and Freedom,” and “Shame on Child Murderers.” 
  
 The Hamas leadership has refused to express support for Mr. Assad despite pressure from Iran, a main backer of Hamas. But with some 650,000 Palestinian refugees living inside Syria, Hamas officials are unlikely to draw Syrian ire by openly criticizing the leadership. |||||
A:
A pair of Iranian warships that had been docked in Syria departed today, after a visit that seemed designed to show support for Bashar al-Assad's regime. The ships arrived Saturday, officially to provide maritime training to Syria, according to Iran's state-run TV. But their presence, along with that of Russian ships, has ratcheted up tensions, the New York Times reports. One senior Iranian lawmaker said they sent "a clear message against the United States' possible adventurism." The lawmaker specifically condemned John McCain's call to arm the Syrian rebels, warning of a "crushing response" from Iran and Russia if the US committed such a "strategic mistake." That wasn't the day's only Iranian saber-rattling, either; the country also warned that it was now considering preemptive strikes to protect its nuclear program. "If we feel our enemies want to endanger Iran's national interests … we will act without waiting for their actions," its deputy armed forces chief said.