PC/Extreme AHC: Germany becomes a part of the the USSR

Find a way for Germany to join the USSR, or at least for as much of Germany as possible to become a part of it. POD could be before or after WW2. How does this benefit them and not benefit them? How does the rest of the world react to this? What would the Cold War look like, if it does happen? Would the USSR last longer or dissolve quicker? What would it look like in general? Discuss.
 
They did annex Kaliningrad which has been an economic plus for them, especially the last twenty years. As to annexing more, Poland is going to need to be a part of the equation and good luck annexing Poland after it achieves independence following WWI.
 
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