It was Is-3 actually. The Is-8 ( T-10 as it was named in army) never exported abroad i.e. out of soviet block. The last more or less combat where the Is-8 had participated was in Prague 1968.
And again ,the weight-classification vary in NATO and out - US still use the 54/57-tonns Abrams as mass prodused main battle tank. This is definetally heavy ( even if to look at the german ww2 standards). The ours most heavy tank never weight more then 52 tonns. The only Is-7 was 68 tonns but it never come out of prototypes.
The World of Tanks game is the only place where the post war heavies seem to do well…
Not only the heaviest but futuristic as well;)
