Why does Kaliningrad belong to Russia?
Kaliningrad: former name is Königsberg. I always wondered about why and how Russia kept Kaliningrad (located between Poland and Lithuania on the seaside). I see the strategic point of the city, it can hold some flotilla, and also I see its population mainly now is Russian. But how it comes that the territory was never questioned, since Russia (more precisely USSR) gained this territory by the second world war. Does anybody have a clue why it never joined to the neighbouring countries or to Germany? Just because Russian population?
The whole modern history of the Russia is the fight to gain access never-frozing sea ports on Balticum. Who actually would question the annexation of Kaliningrad? Germany was in no position to do that.
@CsBalazsHungary Königsberg already was a Russian city, when in 1758 city residents, in retaliation for abandoning them, decided to swear Russian Emperor Elisabeth.
You can as well ask why Breslau (now Polish Wroclaw) didn't join Germany. Or Lithuanian Klaipeda (former German Memel)
As stated in the question, Prussian Konigsberg was in fact depopulated by the Russians after WWII, and annexed. This was part of the terms of surrender, as the region around Gdansk in particular, had long been sore point. (The Gdansk corridor, in particular, was given to Poland after WWI as part of the terms of surrender too.)
Desiring an additional warm water port on the Baltic, Russia chose to place a naval base there. As the remaining Baltics had by then been incorporated into the USSR there was never any questioned opposition by, say, Lithuania. Poland had already been greatly enhanced by the addition of Pomerania and Silesia. As such, territoriality, there were no other claimants.