Early morning alligator crawl on Fox had it that Russian and American experts had found a large cache of nuclear material in someplace...Ukraine? that had been reported missing.
There is and was a lot of non-weapons-grade nuclear material around the ex-USSR, there were even little nuclear "generators" that made heat out in the woods to power equipment. I think most of it was not usable to build a nuke, but merely nasty, toxic stuff that could be used to build a dirty bomb.