NOVO-OGARYOVO, Russia (AP) -- President Vladimir Putin warned the West against taking one-sided action in Syria but also said Russia "doesn't exclude" supporting a U.N. resolution on punitive military strikes if it is proved that Damascus used poison gas on its own people.
In a wide-ranging interview with The Associated Press and Russia's state Channel 1 television, Putin said Moscow has provided some components of the S-300 air defense missile system to Syria but has frozen further shipments. He suggested that Russia may sell the potent missile systems elsewhere if Western nations attack Syria without U.N. Security Council backing.
The interview late Tuesday night at Putin's country residence outside the Russian capital was the only one he granted prior to the summit of G-20 nations in St. Petersburg, which opens Thursday. The summit was supposed to concentrate on the global economy but now looks likely to be dominated by the international crisis over allegations that the Syrian government used chemical weapons in the country's civil war.
Putin said he felt sorry that President Barack Obama canceled a one-on-one meeting in Moscow that was supposed to have happened before the summit. But he expressed hope that the two would have serious discussions about Syria and other issues in St. Petersburg.
"We work, we argue about some issues. We are human. Sometimes one of us gets vexed. But I would like to repeat once again that global mutual interests form a good basis for finding a joint solution to our problems."
The Russian leader, a year into his third term as president, appeared to go out of his way to be conciliatory amid a growing chill in U.S.-Russian relations. The countries have sparred over Syria, the Edward Snowden affair, Russia's treatment of its opposition and the diminishing scope in Russia for civil society groups that receive funding from the West. And Putin denied that Russia has anti-gay policies, despite a law banning gay propaganda that has caused concern about the country's role as host of the Winter Olympics in February.
Obama, speaking Wednesday during a trip to Sweden that replaced his Moscow plans, said relations with Russia have "hit a wall," but also expressed confidence that the two can work together on some issues.
"I have not written off the idea that the United States and Russia are going to continue to have common interests, even as we have some very profound differences on some other issues," he said, noting that those differences include Syria.
Putin said it was "ludicrous" that the government of Syrian President Bashar Assad -- a staunch ally of Russia -- would use chemical weapons at a time when it was holding sway against the rebels.
"From our viewpoint, it seems absolutely absurd that the armed forces -- the regular armed forces, which are on the offensive today and in some areas have encircled the so-called rebels and are finishing them off -- that in these conditions they would start using forbidden chemical weapons while realizing quite well that it could serve as a pretext for applying sanctions against them, including the use of force," he said.
The Obama administration says 1,429 people died in the Aug. 21 attack in a Damascus suburb. Casualty estimates by other groups are far lower, and Assad's government blames the episode on rebels trying to overthrow him. A U.N. inspection team is awaiting lab results on tissue and soil samples it collected while in Syria before completing a report.
Obama expressed frustration at Russia's position, saying: "It has been very difficult to get Russia, working through the Security Council, to acknowledge some of the terrible behavior of the Assad regime."
Putin, however, said the U.S. has failed to make its case through the proper channels.
"If there is evidence that chemical weapons have been used, and used specifically by the regular army, this evidence should be submitted to the U.N. Security Council," said Putin, a former officer in the Soviet KGB. "And it ought to be convincing. It shouldn't be based on some rumors and information obtained by intelligence agencies through some kind of eavesdropping, some conversations and things like that."
He noted that even in the U.S., "there are experts who believe that the evidence presented by the administration doesn't look convincing, and they don't exclude the possibility that the opposition conducted a premeditated, provocative action trying to give their sponsors a pretext for military intervention."
He compared the evidence presented by Washington to false data used by the Bush administration about weapons of mass destruction to justify the 2003 invasion of Iraq.