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.