Koreans?
Not necessarily DPRK Koreans (i.e. NORTH KOREANS):
"Approximately 450,000 ethnic Koreans reside in the former USSR, primarily in the newly independent states of Central Asia. There are also large Korean communities in southern Russia (around Volgograd), the Caucasus, and southern Ukraine. These communities can be traced back to the Koreans who were living in the Russian Far East. In 1937, Stalin deported approximately 200,000 ethnic Koreans to Kazakhstan and Uzbekistan, on the official premise that the Koreans might act as spies for Japan. There is also a separate ethnic Korean community in the Russian island of Sakhalin, where Koreans brought in by Japan as labourers were stranded after the island came into Soviet hands after World War II."
I tend to think that these are ethnic Koreans from one of the SSR republics, and have a grudge towards Moscow and ethnic Russians, for whatever reason. It would be interesting to see if they are muslim. FYI, for example, as of January 1, 1998, 1,123,200 ethnic Koreans lived in Uzbekistan, amounting to 4.7% of the total country's population.