What is the Secret of Russian armor on modern tanks?

In this video we will take a look on what hides behind the armor of modern Russian tanks.
From the T-72 all up to the modern T-90, we will cut them open and take a look at the secret components.

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Sources:
http://btvt.info/1inservice/t-72B.htm
http://btvt.info/1inservice/t-80ud/t-80ud.htm
http://btvt.info/3attackdefensemobility/armor_sweeden.htm
http://btvt.info/1inservice/t-80.htm
http://btvt.info/1inservice/t-80u.htm
http://btvt.info/1inservice/t-90vsabrams.htm
http://btvt.info/1inservice/t-90_v_strou.htm
http://btvt.info/3attackdefensemobility/turret_welded.htm
http://btvt.narod.ru/4/armor.htm
https://below-the-turret-ring.blogspot.rs/2015/06/the-armor-protection-of-t-72-tank.html
http://btvt.narod.ru/4/t-90a/t-90A.htm
"T-80 Standard Tank: The Soviet Army's Last Armored Champion" by Steven J. Zaloga

Видео What is the Secret of Russian armor on modern tanks? канала RedEffect