Stalin was asking his allies to open a second front in Europe during World War II because he believed that the Soviet Union was bearing the brunt of the fighting against Germany and needed support from its Western allies to relieve some of the pressure. Opening a second front would also divert German forces from the Eastern Front, where the bulk of the fighting was taking place, and would ultimately help shorten the war by creating multiple fronts for the Germans to defend against. Additionally, Stalin believed that opening a second front would demonstrate the commitment and solidarity of the Allies in their fight against Germany.
