The United Nations has adopted a resolution supporting efforts by Russia and Turkey to end violence in Syria and start peace negotiations.
Russia and Turkey announced the ceasefire this week, the third truce this year seeking to end the nearly six years of war in Syria.
Peace talks between President Bashar al-Assad's government and rebel forces in Syria are set to take place next year in Kazakhstan.
France has called on Russia to stop military action in Syria and respect a fragile ceasefire agreement brokered by Moscow and Turkey to end almost six years of war.
The truce deal, which was welcomed unanimously by the United Nations Security Council, has been repeatedly violated since it began, with warring sides trading the blame.
On Saturday, Syria rebels warned they would abandon the ceasefire if government forces continued to violate it, asking the Russians, who support President Bashar al-Assad, to rein in army and militia attacks in the valley by 8 pm.
French Prime Minister Bernard Cazeneuve said: "We resolutely condemn everything Russia could do in Syria that would contribute to a continuation of fighting.
"We hope talks between separate Syrian forces will continue so the ceasefire can hold. We ask the Russians to stop taking part in military operations which are deadly operations."
However he did not specify which actions in particular he was referring to.
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