I suspect you might have misinterpreted the question - I believe “state” here means something like an American “state” or a German “Land” - a subdivision within a country. I don’t think that this is a request to create a new “country” in OSM terms, merely to update the subdivisions of an existing one. The constituent parts of Khatumo are in OSM, so it should be easy** for someone familiar with OSM to do…
** someone familiar with editing boundaries in OSM, of course.