Russia sharply steps up criticism of U.S. over Syria Speaking out for the first time since an alleged chemical weapons attack near Damascus on Aug. 21, Putin called on President Obama to find a nonviolent way out of the crisis. "I would like to address Obama as a Nobel Peace Prize laureate: Before using force in Syria, it would be good to think about future casualties," Putin told Russian news agencies in Vladivostok during a tour of the country's flood-stricken Far East. "Russia is urging you to think twice before making a decision on an operation in Syria," he said. Next week's Group of 20 economic summit in St. Petersburg would be a good forum for discussing the Syrian issue, he said, "so why not take advantage of it?" The White House argued Friday that intelligence shows more than 1,400 people died from exposure to chemical weapons in an attack carried out by the Syrian military. Putin said he was sure the attack was the work of rebels trying to provoke international - and especially American - involvement in the Syrian conflict. The regime of Bashar al-Assad, he said, would have had no reason to use chemical weapons at a time when it had gained the upper hand in the fighting. "While the Syrian army is on the offensive, saying that it is the Syrian government that used chemical weapons is utter nonsense," Putin said. On top of that, he said, the Obama administration's "claims that proof exists, but is classified and cannot be presented to anybody, are below criticism. This is plain disrespect for their partners. Putin's comments were soon underlined by a stern statement from the Foreign Ministry. After U.S. Ambassador Michael McFaul had finished a meeting with Deputy Foreign Minister Sergei Ryabkov on Saturday, the ministry declared, "Russia has expressed its conviction that any forceful action against Syria that the U.S. could carry out in circumvention of the U.N. Security Council would be an act of aggression and a gross violation of international law." Putin said he and Obama have not discussed Syria since the incident occurred. "The U.S. president and I certainly discussed this problem at the G8" summit in June in Northern Ireland, he said. And, by the way, we agreed then that we would jointly facilitate peace negotiations in Geneva, and the Americans committed themselves to bringing the armed opposition to these negotiations. I understand this is a difficult process, and it looks like they haven't succeeded in this. Putin said he was surprised by the vote in Britain's Parliament on Thursday not to join a U.S. attack on Syrian military targets. "It shows that there are people guided by common sense there," he said. The Russian president is fond of needling his opponents, often adopting a tone of apparent reasonableness tinged with a considerable amount of condescension. A U.S. assault on Assad's regime would do nothing to hurt his standing, at home or in many countries abroad, where his contempt for Washington tends to play very well. Obama arrives in St. Petersburg for the G20 meeting on Thursday and leaves on Friday. The purpose of the gathering is to discuss economic growth, but the White House acknowledges there will be plenty of conversation about Syria on the side. There are currently no plans for a one-on-one meeting between Putin and Obama, who earlier this month decided not to attend a Moscow summit with the Russian president. On Friday, the head of the foreign affairs committee of the lower house of parliament, Alexei Pushkov, said the Nobel committee should strip Obama of his 2009 Peace Prize if he launches an attack on Syria.