President Vladimir Putin
The two superpowers divided by Syria's civil war met head to head on Thursday, with signs emerging that Russia might curb its support for President Bashar al-Assad and Washington saying events were gathering speed on the ground.
U.S. Secretary of State Hillary Clinton met Russian Foreign Minister Sergei Lavrov in Dublin on the sidelines of a security conference, at a time when rebel advances have brought the 20-month war to the doorstep of the capital Damascus.
"Events on the ground in Syria are accelerating, and we see that in many different ways," Clinton said before the meeting. "The pressure against the regime in and around Damascus seems to be increasing."
Lakhdar Brahimi, the U.N. mediator who convened the meeting, said the two sides had not made any breakthroughs, but would seek a "creative" solution to their impasse, reports Reuters.
Washington and its allies have long sought the overthrow of Assad, while Russia has shielded him at the U.N. Security Council. But comments by an ally of President Vladimir Putin on Thursday indicated Moscow may be losing patience with Assad.
Western countries and international officials have issued coordinated warnings in recent days to Assad not to use chemical weapons. In the latest, the United Nations said Secretary-General Ban Ki-Moon had written to Assad to urge him not to use poison gas.
U.S. officials say they have seen intelligence indicating Assad might be more likely to use chemical weapons, although they have been vague about the nature of the information.