"Do you know why we haven't heard of Russian Nuclear propulsion?"
Like this one? Federalspace.ru
Or this one? Astronautix.com ; Astronautix.com
Actually, the russian space agency may be the leading body in the development of new technology for space travel (especially because the US has severely cut the NASA research funding). Some of the more cutting-edge research they disclose (the chances are that there are much more advanced ones being conducted secretly) include development of force field to shield spacecrafts in interplanetary travel (No, not the laser shield we see in movies... but the kind that protect against solar flares and etc...).
KadTalon
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