France will put a resolution to the UN Security Council to place Syria's chemical weapons under international control so they can be destroyed, Foreign Minister Laurent Fabius says.
He said it would threaten "extremely serious" consequences if Syria breached its conditions.
There would be a request for a complete inspection of all chemical weapons.
Russia also has a plan to put Syria's chemical weapons under international control, it says.
Mr Fabius, who was speaking at a news conference in Paris, said the resolution, based around five points, would demand that Syria "bring fully to light" its chemical weapons programme.
The measure would also set up international inspections and controls of the dismantling process.
The resolution would be tabled under Chapter 7 of the UN charter covering possible military and non-military action to restore peace, Mr Fabius added.
The plan had been discussed before, he said, but has probably been advanced by the pressure applied in recent weeks.
The Russians have blocked all previous French-led efforts at the Security Council, says the BBC's Christian Fraser in Paris.
Both France and the United States are wary of an Iraq-style game of cat and mouse - but they are prepared to give the Moscow-backed plan a chance, our correspondent adds.
What the French are keen to avoid, Mr Fabius said, is a plan that is only there as a delaying tactic, which is why all options, including the threat of a strike, will remain on the table, our correspondent says ( via bbc.co.uk ).