Opponents of peace had consigned Annan's plan to end 13 months of violence in Syria to failure and "are doing a lot to see to it that this prophecy comes true," Foreign Minister Sergei Lavrov said in televised remarks.
"They are doing this by delivering arms to the Syrian opposition and stimulating the activity of rebels who continue to attack both government facilities and ... civilian facilities on a daily basis," he said, without giving specifics.
"Of course, government forces are also taking measures to react to such provocations," Lavrov said.
Lavrov reiterated Russia's calls for foreign countries to press Assad's opponents to comply with Annan's plan, and its criticism of the "Friends of Syria" group of Western and Arab nations, which he said was undermining UN peace efforts.
"There are countries, there are external forces, that are ... encouraging the Syrian opposition not to cooperate with the government in providing for a ceasefire and the subsequent establishment of dialogue," Lavrov said.
