Mongolian-born sumo grand champion Kakuryu, winner of six top division titles, expressed relief Thursday after receiving confirmation he had acquired Japanese citizenship.By meeting the requirement to remain in the Japan Sumo Association as an elder after retirement, the 35-year-old will now be able to run his own stable of wrestlers after his active career has ended.Although Japanese nationality is not required to compete in sumo, citizenship is necessary if a wrestler wishes to progress to become a sumo elder upon retirement and establish or inherit a sumo stable.Related coverage:READ FULL ARTICLE