In 1944, Stoychev became a member of the Fatherland Front's Bureau of the National Committee. During World War II, Stoychev was in command of the Bulgarian First Army after the country switched allegiance to the Allies. Under Stoychev, the Bulgarian First Army helped the Red Army and Yugoslav Partisans drawing the Nazis out of much of Yugoslavia and Hungary, reaching the Austrian Alps by May 1945. On 8 May 1945, Vladimir Stoychev signed a demarcation agreement with British V Corps commander Charles Keightley in southern Austria. On 24 June 1945, he took part in the Moscow Victory Parade.