sentences:  After the Manchurian Incident, and the establishment of Japanese control over all of Manchuria in 1931, another wave of Korean immigration occurred, this time with Japanese encouragement, to help cement Japanese claims on the territory.With the establishment of Manchukuo in 1932, the situation in Gando was very unstable, with the local population rent into pro-Japanese and anti-Japanese/anti-Manchukuo factions, many of which resorted to guerrilla warfare.In an effort to subjugate the region, the Kwantung Army recruited pro-Japanese Koreans into a special warfare force, which it incorporated into, and had trained by the Manchukuo Imperial Army primarily in counter insurgency tactics.