In 1941, it was Russia's turn, yet Joseph Stalin refused to believe the multiple warnings of a German invasion.
 Operation Barbarossa began in June 1941, captured  or destroyed multiple Soviet armies, and reached the gates of Moscow by December.
Stalin fought back and forged close relations with Britain and the United States, both of which provided large amounts of munitions.

The Eastern Front became the horrendous ideological and race war with more than 20 million killed, including Soviet prisoners of war and Jews.
It was perhaps the bloodiest conflict in human history.
In 1941, it was Russia's turn, yet Joseph Stalin refused to believe the multiple warnings of a German invasion.  Operation Barbarossa began in June 1941, captured  or destroyed multiple Soviet armies, and reached the gates of Moscow by December. Stalin fought back and forged close relations with Britain and the United States, both of which provided large amounts of munitions.
The Eastern Front became the horrendous ideological and race war with more than 20 million killed, including Soviet prisoners of war and Jews. It was perhaps the bloodiest conflict in human history.
Germany–Russia relations