The Russians stole everything they could. They did not believe in property rights, remember?
On the other hand, considering they had lost millions of people to the Germans, and had almost lost twice in 25 years, it is easy to understand their insistence on a buffer zone, and for "reparations" for the war.
The great death toll was much the fault of Stalin. Giving American humanitarian aid was right, but they never should have been given so much help that they became am advancing force that entered Berlin first. Short term gain, long term loss.