Russian Foreign Minister Sergei Lavrov warned the West on Tuesday against any unilateral action on Syria after President Barack Obama said U.S. forces could act if the Syrian leader deployed chemical weapons against rebels trying to topple him, according to Reuters. Russia and China have opposed military intervention in Syria throughout 17 months of bloodshed and have vetoed three U.N. Security Council resolutions backed by Western and Arab states that would have raised pressure on Damascus to end violence. Lavrov spoke at a meeting with China's top diplomat one day after Obama, in some of his strongest language yet, said U.S. forces could move against Syrian President Bashar al-Assad if he resorted to chemical weapons against insurgents. Russia and China base their diplomatic cooperation on "the need to strictly adhere to the norms of international law and the principles contained in the U.N. Charter, and not to allow their violation", Lavrov said at a meeting with Chinese State Councillor Dai Bingguo. "I think this is the only correct path in today's conditions," Lavrov told Dai, who also met President Vladimir Putin and his top security adviser, Nikolai Patrushev, on Monday for consultations went unannounced by the Kremlin. Lavrov's remarks underscored Moscow's wish to keep international efforts to end Syria's crisis within the United Nations, where Russia and China wield clout as two of the five permanent Security Council members with veto power. Frustrated by the vetoes and by the refusal of Russia and China to join calls for Assad to leave power, the United States and other Western and Arab countries are seeking other ways to exert influence on the situation in Syria. Obama said on Monday he had refrained "at this point" from ordering military engagement in Syria. But when asked whether he might deploy forces, for example to secure Syrian chemical and biological weapons, he said his view could change. Russia has also expressed concern about Syria chemical weapons, saying it had told Damascus that even the threat to use them was unacceptable. -- SPA