The warning came after the US, UK and France struck three Syrian sites in response to a suspected deadly chemical attack in the town of Douma a week ago.
Syria denies any chemical use and says that attack was fabricated by rebels.
A UN Security Council vote brought by Syria's ally, Russia, and condemning the US-led strikes was rejected.
The wave of strikes represents the most significant attack against President Bashar al-Assad's government by Western powers in seven years of Syria's civil war.
There was a bitter exchange at a UN Security Council emergency meeting on Saturday as Russia sought to secure a condemnation of the early morning air strikes by Western powers.
Russia's UN envoy, Vassily Nebenzia, read out a quote from President Vladimir Putin accusing the allies of "cynical disdain" in acting without waiting for the results of a chemical watchdog investigation into the Douma incident.
Inspectors from the Organisation for the Prohibition of Chemical Weapons (OPCW) are currently in Damascus and are expected to visit Douma this weekend.
Mr Nebenzia accused the US, UK and France of "hooliganism" and of "demonstrating a blatant disregard for international law".
Photo caption:A streak of light arcs across the sky over a city.