Why not, it gives him half of Poland without the danger of a two front war.
Germany has become a accomplice of Russia in the seizure of foreign countries and the occupation of their territories.
What did Germany get from Russians in August 1939? About this, Hitler wrote to his friend Mussolini:
I may tell you, Duce, that through these arrangements the favorable attitude of Russia in case of any conflict is assured... I believe I may say to you, Duce, that through the negotiations with Soviet Russia a completely new situation in world politics has been produced which must be regarded as the greatest possible gain for the Axis.
- Do you need to explain what Hitler received and what he writes about here? He received a solid rear for his Reich in the upcoming war - and an ideological ally in the seizure of foreign countries. He received a huge and extremely militarized country, which turned out to be on the side of the Third Reich after it unleashed the WWII. And on September 17 he's got Russia that became the ONLY combat ally of the Reich in conducting the first military campaign in the WWII
In fact, after Hitler realized that Russia was ready to enter into an ideological and political alliance with Germany and begin to cut the map of Europe within an agreement with Germany, he had a feeling that wings grew behind his back. And after that he rushed into a big war without any fear of failure
I can only add that Hitler was able to begin the invasion of France and other countries in 1940 only because in the rear he felt the active support of Russia. Without such a benevolent and pro-German rear, the Reich would not have ventured into a big campaign in the West in 1940.
Have no doubt.
The Kremlin will publicly stigmatize France and England for not agreeing to end the war against Nazism, and then Russia congratulated the Third Reich on its victory over France
And I must say that in Western historiography the aggressive role of Russia in WWII in 1939-1940 and its active support for Nazism are almost ignored.