Deep operation (glubokaya operatsiya), also known as Soviet Deep Battle, was a military theory developed by the Soviet Union for its armed forces during the 1920s and 1930s.
A front (фронт, front) is a type of military formation that originated in the Russian Empire, and has been used by the Polish Army, the Red Army, the Soviet Army, and Turkey.
A military reserve, reserve formation, or simply reserve, is a group of military personnel or units which are initially not committed to a battle by their commander so that they are available to address unforeseen situations or exploit sudden opportunities.
The Workers' and Peasants' Red Army (Рабоче-крестьянская Красная армия (РККА), Raboche-krest'yanskaya Krasnaya armiya (RKKA), frequently shortened in Russian to Красная aрмия (КА), Krasnaya armiya (KA), in English: Red Army, also in critical literature and folklore of that epoch – Red Horde, Army of Work) was the army and the air force of the Russian Soviet Federative Socialist Republic, and, after 1922, the Union of Soviet Socialist Republics.
The Reserve Armies were a group of armies formed by the Soviet Union's Red Army during World War II.
The Armed Forces of the Russian Federation (r) are the military service of the Russian Federation, established after the dissolution of the Soviet Union.
The Stavka (Ставка) was the high command of the armed forces in the Russian Empire and the Soviet Union.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.