Moscow (CNN) -- The Russian president is fighting back: no, he did not steal a Super Bowl ring. And no, he's not rocking the diamond-encrusted prize on his finger, either. President Vladimir Putin's spokesman denied accusations that the leader pocketed a Super Bowl ring that belonged to the New England Patriots' owner, Robert Kraft. The alleged swipe occurred during Kraft's visit to St. Petersburg in 2005. "I took out the ring and showed it to (Putin). And he put it on and he goes, 'I can kill someone with this ring,'" Kraft said, according to the New York Post. "I...