I think it is likely that the French were acting on behalf of the Israelis when they blocked an agreement on Iran's nuclear program. A newer NYT article puts some of the blame on the Iranians, which is no doubt partly true, but it is most likely that Jews -- French, American and Israeli -- threw a monkey wrench into the works. Today's NYT article reports that US delegation head Wendy Sherman flew immediately to Israel to brief Israeli reporters, but refused to include US reporters stationed in Israel in her briefing.
I worry that the French delegation at the Geneva talks on Iran was representing the views of French Jews, who have a lot of political influence in France. It indicates that in France, as in America, many Jews have divided allegiances between their home country and Israel. Years ago, France was instrumental in helping Israel develop its atomic bomb program.