>>213694688
It was Chinese at the time we took it.
>no koreans are right now living there
Some do, but they're not probably the one who were original.
Stalin was paranoid and decided to resettle them, because he was afraid that they can start to work together with you.
Also according to historical data there were around 5000 Koreans when we took the land. Many of them migrated much later, when it was already our territory.
There is a wiki article on some of it on wiki, but only in Russian language.