(FILES) This file photo taken on February 4, 2018 shows a South Korean supporter of the unified Korea female ice hockey team waving a "Unification flag" toward people protesting against the team, outside an ice rink before a friendly ice hockey match between the combined team and Sweden, in the western city of Incheon on February 4, 2018 ahead of the Pyeongchang 2018 Winter Olympic Games. Japan said on February 5, 2018 it had lodged a protest with South Korea over the "unacceptable" use of a unified Korean Olympic flag that features a set of disputed islands. / AFP PHOTO / KIM DOO-HO