It's official ... boxing legend Roy Jones Jr. is now a full Russian citizen -- with a passport to prove it.
Roy had personally asked Vladimir Putin to get him citizenship back in August so he could do more business in Russia ... business that includes boxing and promoting other fights.
Putin obliged ... and on Tuesday, Jones Jr. got his passport -- which he flaunted around Moscow while draped in a Russian flag. He thanks Putin for making it happen.
But Jones says he still bleeds red, white and blue and hopes the move will unite his two favorite countries -- "I'm happy to bring the U.S. and Russia together in the ring."
Jones is scheduled to fight Welsh bigman Enzo Maccarinelli in Russia on November 28th -- we're guessing Putin will have front row seats.