Original sentence: After the Soviet government approved the formation of a Jewish Autonomous District in Birobidzhan, members of the Koryo Saram petitioned for the establishment of a Far Eastern Korean National District.As more Korean immigrants arrived in the Russian Far East, the Korean minority became one of the largest border minorities in the Soviet Union, facing in the 1920s and the 1930s the Japanese-occupied Korea on the other side.Suspicions of the “political unreliability” of Koreans, however, meant that in practice very few would ever receive citizenship; in 1923, 1300 out of 6000 applicants were accepted for citizenship, and in the following year, 1247 out of 4761.The Korean immigration increased dramatically during the early 1920s, after the Russo-Japanese war of 1904–1905 and Japan’s subsequent establishment of a protectorate over Korea.This was denied in 1929, due to opposition from the local Russian population fearing competition for land, as well as the political goal of maintaining a peaceful stance toward Imperial Japan
Edited sentence: After the Soviet Government approved the formation of a Jewish Autonomous District in Birobidzhan, members of the Koryo Saram petitioned for the establishment of a Far Eastern Korean National District.As more Korean immigrants arrived in the Russian Far East, the Korean minority they became one of the largest border minorities in the Soviet Union, facing in the 1920s and the 1930s the Japanese-occupied Korea on the other side.Suspicions of the “political unreliability” of Koreans, however, meant that in practice very few would ever receive citizenship; in 1923 only 1300 out of 6000 applicants were accepted for citizenship, and in the following year, only 1247 out of 4761.The Korean immigration increased dramatically during the early 1920s, after the Russo-Japanese war of 1904-1905 and Japan’s subsequent establishment of a protectorate over Korea.This was denied in 1929,  due to opposition from the local Russian population fearing competition for land, as well as the political goal of maintaining a peaceful stance toward Imperial Japan