Russia already has more than enough nukes and has agreed to limit its stockpiles together with the US (this agreement includes mutual monitoring of warheads). None of those countries need the "burner" reactors or imported spent fuel rods to build more nukes (and usually those rods are simply returned to a country of production), there are far easier ways of doing it. Uranium ore can be easily bought on international market and even can be extracted from the ocean water at a reasonable (but economically unviable at the moment) cost.