Kammala wannan jumla: A 1940, sakamakon yarjejeniyar Molotov-Ribbentrop, Romania ta kasance
An tilasta shi ya ba da wani ɓangare na yankunanta ga Tarayyar Soviet, ciki har da Chișinău, inda aka kafa SSR na Moldavian. Sabbin hukumomi sun rufe cibiyar Kotsovsky. Cibiyar ta sake buɗewa lokacin da, bayan barkewar Yaƙin Duniya na II, Chișinău ta mallaki sojojin Axis. Kotsovsky ya ci gaba da aikinsa na kimiyya a lokacin yakin duniya na biyu. A wannan lokacin, ya buga aikinsa galibi a cikin mujallolin kimiyya na Jamusawa da Austriya.