In the film, on the gate (which is not present) is Montenegrin eagle, and not the Russian one.
In a pool in a certain palace there is a shot of Putin floating in the Enisey. The footage of Putin swimming in the Enisey went around the world.
The investigation itself focuses on the correspondence of the eagle to that on the gates in the winter palace of St. Petersburg.
Investigation shows interior - Czech library. In reality there is only empty room with bare concrete walls.
There is no gate with an eagle, no gate at all.
Outside, the building is completely finished, but inside there are only empty rooms with bare concrete walls.