I thought Gorbachev already admitted to the NKVD’s responsibility for the massacre, including the release of damning documents.
You know, I seem to recall that too. But I think under Putin there has been a move to retrench and obscure the official Soviet/Russian role; the inability to locate documents in Soviet archives perhaps being an indicator of this.
“We can’t find any report on this in our files, so it must have never happened. You are lying! It’s a provocation! We won’t put up with this abuse! Alert the Army for deployment to the border!”