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Nuclear scorecard

With Russian President Vladimir Putin threatening to target missiles on Europe if the U.S. goes ahead with antimissile plans in Eastern Europe, what is the status of the world's nuclear arsenals? One would think that with the Cold War over for more than 15 years, the number of nuclear weapons in the U.S. and Russia would be limited.

Not so.

Estimates by the Federation of Atomic Scientists (FAS) put the number of nuclear weapons still operational in the two countries at more than 10,000 -- enough to destroy all human life many times over, but less than what it was during the height of the Cold War.

According to the most recent FAS estimates, completed in the last month:

--The U.S. has 4,663 strategic nuclear weapons, that is, weapons capable of striking Russian targets, and 500 tactical nuclear weapons, for a total of 5,163.   
--Russia has 3,340 strategic nuclear weapons and 2,330 tactical for a total of 5,670. 

The two nations account for about 95 percent of the world's nuclear stockpiles. In addition, both countries  have inactive stockpiles, roughly 10,000 in Russia and 5,000 in the U.S. Moreover, there are thousands of plutonium "pits" -- the core of nuclear weapons -- stored here and there.

And while each have plans to further downsize their nuclear forces, both are also working on new warhead designs and new missiles. Here's a handy list of who has what worldwide.