International Maritime borders have to be negotiated. This is true of almost all countries, because they all overlap (2km radius from mexico overlaps with 2km radius of US on the edges). This leads to interesting compromises such as Franch having fishing rights in Canada because it still controls 2 islands. Those fishing rights aren`t even in a radius, but a straight line. For other countries such as the Koreas, it`s an impetus for war.
Greek PM says may have to call early election (Reuters)
from the article: Report: Turkish ship explores near Cypriot gas rig