This is a mysterious place and there's not a lot (or actually any) information about it online.
Maybe this is a soviet military or some kind of other base left in the middle of forest.
Maybe the territory is owned by someone.
Maybe the territory is abandoned.
Maybe the territory is full of trash and nobody really maintains it.
Maybe from the top of the tower you will see a beautiful view of the forest surrounding it.
Maybe the cache is magnetic.
Maybe (but no, seriously), be careful when getting the cache. I am not really sure how old the tower is, nor how secure it is to climb it. I take no responsibility for any consequences caused by climbing the tower or entering the territory in general.