I have tried to do some research on the subject of:
“Attacks/Fatalities of Allied Occupation Forces After the War in Europe and Japan”
But information is equally unavailable.
There is some information about the German terrorist attacks against the western occupiers, very little out there about attacks against the Russians.
This source might have some helpful information
Ziemke, Earl F.
The U.S. Army in the Occupation of Germany 1944-1946.
Center for Military History, United States Army; Washington, D.C.; 1975
Most information I have is about the SS Werwolf/Werewolf organization.