Whether or not M1A2s are equal or inferior to a tricked-out T-90 is a long, long debate.
There is also China, but I personally don't think much of their new tanks.
That's an interesting way to put it! From my basic reading I'd consider the M1A2 to have an edge over the T-90MS. If you look at the bigger picture (logistics and total cost of a war), then the T-90MS might have an edge.
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1. https://en.wikipedia.org/wiki/Nuclear_doctrine_of_Pakistan