Who canceled the project for the Landkreuzer P. 1000 Ratte, which would have surpassed the Panzer VIII Maus as being the heaviest fully enclosed armoured fighting vehicle ever built?
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 the advancing Soviet forces.
R-3 (tank) R-3 was a proposed Romanian tank design for use in World War II. It was basically a variant of the Czechoslovak S-II-c tank prototype (known as the T-21 tank after 1939) which was going to be built in Romania because of the repeated acquisition failures. Because of political reasons and the limited industrial capacities of both Škoda Works and the Romanian industry, the design never entered production.