i have no clue if the UWW "owns" rights to that tourney, but, it clearly was a UWW sanctioned event previously and would not exist as such now...
regardless, they are still wrestling in russian no matter what ridiculous ban is being imposed on their athletes, so, i can not see any reason an athlete could not go over for whatever they wanted as long as they are ok with some online whining that would inevitably come from someone with an agenda...