I've found it in my kitchen. It seems to be that he flew through the window from the street.
The country is Russia.
I am not an entomologist, I just happen to have worked on the genome of the red flour beetle, Tribolium castaneum and this looks very similar. A quick wikipedia search turned up the amusingly named "confused flour beetle", Tribolium confusa, which looks almost exactly like what you have photographed:
So, I would guess (I stress that I don't really know) that this is some sort of Tribolium species and, by now, is thoroughly confused even if it was not to begin with.
This is Mealworm beetle, Tenebrio molitor, a species of darkling beetle.
Thank you @terdon for help!