Ka kammala wannan magana: A shekara ta 1927, an kira Kim ya shiga aikin soja. Ya kammala karatunsa daga makarantar kananan kwamandoji kuma ya zama mataimakin kwamandan kwamitin. A cikin 1927 ya shiga Jam'iyyar Kwaminis ta Tarayyar Soviet kuma a cikin 1929, ya shiga cikin ayyukan soja na Soviet Union.
rikici kan hanyar jirgin kasa ta Gabashin China. A cikin 1930, ya zama shugaban kamfanin. An aika Kim zuwa Makarantar Sojojin Moscow da ake kira bayan V.I. Lenin, wanda ya kammala karatu a 1932. Ya yi aiki a matsayin kwamandan kamfanin na 76th Rifle Regiment na 26th Kazan Rifle Division da ke zaune a Yelabuga, Tatar ASSR.