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The US for example still has more than half of its 1990 arsenal. And estimated destruction capability is still about 2/3.

Stockpile in the 60's was way bigger though and there already was a massive reduction in the 70's and 80's.

Soviets and later Russia at some point had an even bigger stockpile but also reduced it massively. But US and Russia combined have an estimated destruction capability of 4.000 megatons> 4.000.000 kt. That ist 200.000 times the Fat Man bomb which destroyed Nagasaki , just more accurate.

Again, this is the reduced stockpile of today. Without the giant multi megaton devices of the 50's and 60's.