Kammala jumla mai zuwa: Daga Disamba zuwa Maris 1940, Korobkov ya shiga cikin Yakin hunturu a matsayin mai ba da shawara ga kwamandan Rundunar Sojojin Sama ta 25 da kuma mataimaki ga kwamandan rundunar Sojojin Sama ta 14. A watan Afrilu, ya zama kwamandan Rundunar Sojan Sama ta 12 a Yankin Soja na Musamman na Kiev. A ranar 7 ga Mayu, an ba shi lambar yabo ta biyu ta Red Banner. A watan Yuni da Yuli, rundunar ta shiga cikin
Harkokin Soviet na Bessarabia.