 The Korean population there trace their roots back to a variety of sources.Aside from roughly 33,000 CIS nationals, mostly migrants retracing in reverse the 1937 deportation of their ancestors, between 4,000 and 12,000 North Korean migrant labourers can be found in the region.Smaller numbers of South Koreans and ethnic Koreans from China have also come to the region to settle, invest, and/or engage in cross-border trade.