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No, in fact, both US and Russian space agencies are currently suffering from an acute shortage of plutonium. Russia has almost all the remaining stockpile, measured in a few kilograms, and that stock pile will be depleted in a few years.
Here's a larger estimate:
U.S., Russia Recast Plutonium-Disposition Pact
Russia has an estimated stockpile of 120-170 metric tons of weapons-grade plutonium
http://www.armscontrol.org/act/2007_12/USRussia
It only takes a few pounds to make a bomb.
Creating a sustained critical chain reaction is an exceedingly complicated process.
Controlling a chain reaction is complicated, nitwit. Creating one isn't. How controlled do you think an atomic bomb is?
And these are just atomic bombs. The thermonuclear device is detonated by the much smaller atomic bomb and is vastly more powerful. Got any idiotic lying propaganda about those?