Kaliningrad oblast is clearly labelled "Russia" on the map so it seems unlikely that anybody would make the mistake you're implying.

Looking at the map it's clear that OP means Białystok.

Actaully, after having read the legend at the left of the image, it is clear that many lower-power lines are left out, so it is possible, even likely, that Białystok has a connection to the rest of the country.