During WWII the Mosin-Nagant was the Soviet army’s standard longarm. After WWII, all of the client communist nations in eastern Europe used it. The case of Romania is interesting in that its run predated WWII itself, and continued right to the end of the Cold War in 1989.
(Mosin-Nagant M44 carbine of Romania’s brief post-WWII production run.) (photo via National Rifle Association)
(“Instructie” stamp on a Romanian Mosin-Nagant.)
(Members of Romania’s Gărzile Patriotice (Patriotic Guards) march with WWII Mosin-Nagants during the 1970s.)