The Vichy regime, proclaimed by Marshal Philippe Pétain after the Fall of France in 1940 before Nazi Germany, was quickly recognized by the Allies, as well as by the USSR, until 30 June 1941 and Operation Barbarossa. However, Vichy France broke with the United Kingdom after the destruction of the French Fleet at Mers-el-Kebir. Canada maintained diplomatic relations until the occupation of Southern France (Case Anton) by Germany in November 1942.