paris france friday firmly back u.n.-led peace talk syria geneva say responsibility fail negotiations since end november fell entirely government delegation round syria peace talk end thursday big miss opportunity may talk january ideas find encourage president bashar al-assad government engage u.n. mediator staffan de mistura say thursday alternative negotiate political solution agree party auspices unite nations deputy foreign ministry spokesman alexandre georgini tell reporters daily brief reiterate paris support de mistura deplore attitude syrian regime refuse engage discussion syrian regime responsible lack progress negotiations say despite fail round u.n. syria talk viable peace effort france say