Roy Jones Jr. is clapping back at Wladimir Klitschko -- after the former 2x heavyweight champ from Ukraine questioned RJJ's "moral compass" for his close relationship with Russia -- with the Hall of Fame boxer saying he doesn't want to see anyone hurt ... Russian or Ukrainian.
And, Jones Jr. makes it clear ... if Wladimir continues to badmouth him, they can get in a ring and figure out their differences.
"I have people on both sides of the fence. I don't wanna see nobody die. Nobody fight like that because people die of war.