Panzer VIII Maus
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armoured fighting vehicle ever built. Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by advancing Soviet military forces.
Tanks of the interwar period
Initially, the tanks and armored cars in Soviet hands were a mix of FT-17 imports and a few British tanks left behind in the civil war. The first Soviet tank, the T-18 (sometimes called MS-1) was a fairly close copy of the FT-17, but with improved suspension and a larger turret. Stalin's enthusiasm for industrialisation and mechanisation drove an aggressive military development program, resulting in by far the largest and broadest tank inventory of all nations by the late 1930s.