Lavrov said a US attack would be a fatal blow to peace efforts.
China urged the US to proceed with extreme caution and return to the UN to discuss Syria after Washington said it was not seeking UN Security Council approval for action.
Chinese Minister of Foreign Affairs Wang Yi (王毅) said countries should “think thrice” before acting and exercise “extreme caution.”
The US “should return to the UN Security Council framework to seek consensus and appropriately handle the Syria issue,” Wang told US Secretary of State John Kerry in a telephone call on Sunday night.
“It is high time to let reason prevail over recklessness,” Xinhua news agency said in a commentary, which reflects official thinking.