Did a quick search and didn't find it. All I remember is it was written up in a rather major publication some years ago talking about the fall of Stasi.

While trying to find my source, I did find out Putin was in East Germany when the wall fell, and was working for KGB. Along with Stasi, Putin burned so much evidence of their wrongdoing, it broke the furnace.

So I guess Putin was a questionable fellow even back in the 1980's and 1990's!