seeing how he claimed all the "northern" part of the world, even those of different countries/regions/nations, IF (and i repeat the IF) it had to be "split" the story side would be about regional/political problems of cohabitations, internal strifes, and the like.
That's for the Rp.
For the rest, you could use it as one npc (non playable character) region. like for example the rest of the grey area is.
OR you could evenly split it's resources among the others countries, because "the inuk have dispersed themselves, and have promptly been absorbed by all the other nations"