Just to add some context here. The Ahvenanmaa/Åland islands are a group of islands under Finnish control in the Baltic sea between Finland and Sweden. They have been a demilitarized zone for 150 years, since the 1856 Treaty of Paris.
I don't think they are, but it could be an intresting focus for a possible upcoming Finnish national focus tree. Like the Finnish version of the German Rhineland focus, you could remove the demilitarization if you had done some previous focuses.