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direct comparison between Leopard 2 A4 & Leopard 2A5 vs T-80U & T-90 proves that the Leoaprd 2 is the better protected tank by armor.
But wasn't that obvious? Just comparing the size of both tanks makes it clear. The Leoaprd 2 is by far one of the best protected tanks in the World hands down, not only because of the Active protection System which it will receive soon (with the new Leoaprd 2A7 next year), but also because of the extreme heavy modular armor block (package) that is mounted on the turret. The Leopard 2 is not for no reason twice as heavy as the T-90. Also the Leclerc, Challenger 2 and Merkava 4 have the exact same kind of advanced modular armour blocks on the turret which make them much heavier than the Russian tanks, but therefore increase the protection level radical! After several tests and fire trials the leopard 2's front armor was found to be immune against any anti tank weapons as there is no weapon which can penetrate 2,000mm RHA armour. No ATGMs and no RPGs are capable of penetrating the Leopard 2's front armor on the turret, as the round/warhead/grenade/missile just stuck in the thick armor block.
While the armor of a ERA-equipped T-90 was penetrated 3 times by RPG-29 (source: Fofanov.armor.kiev.ua), yet the Leoaprd 2A5 & A6 resisted even this powerful threat. Hehe. There is a reason why so many countries bought the Leoaprd as their main battle tank, it is not for no reason officially the best tank in the world.