What was the reason germany declared war on russia?

Answer 1

What happened was that Russia had promised to defend Serbia in the event of an Austrian or Turkish attack, and so when Serbia was attacked by Austria and her Bulgarian allies, Russia declared war.

Answer 2

There are two version why Germany attacked the Sowjet Union.

1.) The official (Nazi) version: It was an pre-emptive war, because the russian army gathered their troops at the German-Russian border. Also the Reichsgovernment told the germans, that the arian race needs new living space in the East ("Lebensraum im Osten") and therefore the russian "subhuman beings" should be eliminated.

2.) The historical version: War is expensive. With German troops occupyed most of Europe and parts of northern Africa, we simply needed more ressources to supply the Army and the homeland. Especially we had vested interests in the Ukraine, which has been called the "breadbasket" of Europe and in the oil-fields of Baku in Azerbaidzhan, where we planned to get our fuel from to continue or expend the war.

Also Hitler and the government needed an atmosphere of fear and constant threat to legitimate the domestic political changes in the homeland.

That´s what I learned and know about this. Hope it helped.

byebye

greetings from Berlin

Answer 3

The reason (or excuse) was Russian mobilization along the border with Austria-Hungary and Germany.