This is a disaster for France and it was the last nail in its coffin. Macron as the president will make sure that France losses its sovereignty and remains as a vassal state of Germany and the United States.
No disaster will happen. Europe consists of a large number of States which themselves cannot withstand a large aggressive States such as Russia. Only a United Europe, with U.S. support, can resist pressure from outside. The Makron is the French victory and Russian defeat.
France is a nuclear power and a powerful country, and it can defend itself against the Russians (if the latter ever attack). They don't need the support from the warmongering Americans. BTW.... looking back in history, it was France which tried to invade Russia (under Napoleon). Went quite bad for them.
Now the situation has changed and Russia attacks France. Only to fight the Russians are afraid because France is a NATO member. So the Russians are waging a war against the whole of Europe and the USA hybrid methods. Now Putin is trying to divide Europe and destroy the EU. The existence of nuclear weapons is not a hindrance.