 Maslennikov's border troops took part in the occupation of Poland in September 1939.In October of the same year, Maslennikov was engaged in the planning of occupation of the Baltic states and in the German-Soviet commission on repatriation from former Poland and Baltic states.According to the German reports, Maslennikov openly admitted that the Soviets "need no wealthy Ukrainians and Belarusians, only the proletariat"; this, incidentally, led Germans to assume that the Soviets did not care about the Jews at all.