Joseph Stalin was irritated by the results of the Munich Conference. On 2 May 1935, France and the Soviet Union sign the Franco-Soviet Assistance Treaty with the aim of curbing Nazi German aggression.  The Soviets, who had a mutual military aid treaty with Czechoslovakia, felt betrayed by France, which also had a mutual military aid treaty with Czechoslovakia.  However, the British and French mostly used the Soviets as a threat to swing at the Germans. Stalin concluded that the West had actively collaborated with Hitler to hand over a Central European country to the Germans, raising fears that they might do the same with the Soviet Union in the future to allow the division of the USSR among Western nations. This belief led the Soviet Union to focus its foreign policy on a rapprochement with Germany, which eventually led to the signing of the Molotov-Ribbentrop Pact in 1939.  As a result, Bohemia, Moravia and Silesia lost about 38% of their total area to Germany, with about 2.8 million Germans and 513,000 to 750,000 Czech inhabitants. Hungary, in turn, received 11,882 km2 (4,588 square miles) in southern Slovakia and southern Carpathian Ruthenia. According to a 1941 census, about 86.5% of the population was on the territory of Hungary. Slovakia lost 10,390 km2 (4,010 square miles) and 854,218 inhabitants to Hungary (according to a 1930 Czechoslovak census, about 59% were Hungarians and 31.9% were Slovaks and Czechs).