Placed at the disposal of the Main Personnel Directorate in August, Popov was appointed commander of the 94th Rifle Corps in the RVGK late that month. In November the corps joined the 1st Guards and then the 38th Armies of the 1st Ukrainian Front and fought in the Battle of the Dnieper, the Zhitomir–Berdichev offensive, and the Proskurov-Chernovitsy Offensive, in which it captured Starokonstantinov and Ternopol. In June 1944 the corps was relocated to the Karelian Front, where it joined the 7th Army, then in July to the 21st Army of the Leningrad Front. With the army, the corps fought in the Vyborg–Petrozavodsk offensive. In October the corps was withdrawn to the RVGK and relocated to the 3rd Belorussian Front. As part of the 21st, 11th Guards, 31st and 39th Armies of the front (then the Zemland Group of Forces from March 1945), the corps distinguished itself in the East Prussian offensive, taking the fortified points of Pillkallen and Schillen. In May 1945, the corps and its army were relocated to the Soviet Far East to join the Transbaikal Front, with which it fought in the Soviet invasion of Manchuria, being awarded the Order of the Red Banner.