The war in Syria, which began with protests in March 2011, has killed more than 220,000 people. Russia, which has traditionally strong ties to Syria, has been seen as a key to a peaceful solution and has previously rebuffed suggestions that Assad's resignation could help end the war.
Syrian Foreign Minister Walid al-Moallem held talks with Russian Foreign Minister Sergey Lavrov on Monday then was whisked to the Kremlin to meet with Putin.
Putin told the Syrian envoy that Russia's "policy to support Syria, the Syrian leadership and the Syrian people remains unchanged."
