There is an enormous amount of ignorant comments being posted here. Allow me to address a few of the misconceptions.
a) Currently, there are *no* current satellites or probes that use nuclear propulsion. There are some that use RTGs (nuclear batteries) to generate electricity to run essential systems, but not as a means to actually move the satellite. This would be something new.
b) There is essentially zero risk from having nuclear-powered spacecraft in orbit. Containment cores can easily be constructed able to survive accidental deorbiting or even catastrophic launch failure. The nuclear RTG from Apollo 13's lunar module crashed into the Pacific Ocean; there was no release of radioactivity.
c) The "problem" of space debris is certainly real, but not nearly the critical issue some of you seem to believe. Space is far larger than it appears on these debris-tracking maps...and any debris in LEO is going to come down fairly soon on its own anyway. It's the debris in geosynch that remains effectively forever ... but that far out, you're talking about a shell that's nearly 50,000 miles across; a volume nearly 300 times larger than the entire earth.
d) Russia is most definitely not spending $2B to "cleanup space junk". This is a technology demonstrator platform first and foremost, and the technology developed will have enormous defense applications, whether or not this actual satellite itself is used for anything besides satellite capture.
e) For those of you whining about not spending this money on "starving babies", I am truly astounded you are so ignorant and short-sighted. Do you honestly not realize how the exploitation of space has already improved our lives? Hurricane monitoring by weather satellites alone has saved hundreds of thousands of lives, and communication satellites have revolutionized the industry.