A film about the friendship between the peoples of the USSR and Socialist Bulgaria. Newsreel: Bulgarian partisans are walking along the path; residents of the Bulgarian city greet the Soviet soldiers who liberated Bulgaria from the fascist invaders. Monuments to Soviet soldiers, Russian soldiers. The military oath of Soviet and Bulgarian tankmen doing military service in sister regiments; exchange of commemorative banners of Soviet-Bulgarian and Bulgarian-Soviet friendship. Meetings of Soviet and Bulgarian soldiers of the Soviet-Bulgarian friendship regiments to exchange experience. Combat exercises of tankmen of the Soviet regiment. Training night fight. An armored personnel carrier that is out of order due to the fault of the driver. Discussion of the driver's negligence at the Komsomol meeting. Bulgarian tankers get into the tanks; tanks on the march. The commanders of the Soviet and Bulgarian sister regiments Urazmatov and Hristov are talking. Bulgarian officers studying in the USSR at the Military Academy, classrooms, laboratories. Joint military exercises of the armies of the Warsaw Pact. Bulgarian Minister of National Defense Dzhurov says (synchronously) about the friendship between the armies of Bulgaria and the Soviet Union.