When Nazi Germany invaded the Soviet Union in June 1941, Gustaf V tried to write a private letter to Hitler thanking him for taking care of the "Bolshevik pest" and congratulating him on his "already achieved victories".
Kada je Njemačka napala Sovjetski savez u listopadu 1941. godine, Gustav V. je Hitleru napisao privatno pismo u kojem mu je zahvalio na napadu na "boljševičku gamad" i čestitao na "već postignutim pobjedama".