Norway occupied parts of Greenland for a while, 1931-1933, I’d call that an act of aggression against Denmark and thus a war even if it was ultimately resolved peacefully and the claim didn’t concern the Danish mainlands.

Norway and Denmark don’t have a land border. Thus including alliances in general the Anglo-Portuguese one dates back to 1373, with only 60 years interruption when Portugal was in dynastic union with Spain which in modern terms could be called an occupation.

…and this isn’t just a technicality with both nations being big on seafaring you can consider the water between them a highway, French cannons nonwithstanding.

The criteria as set out in the treaties is to be “a European country”, what “European” means has been deliberately left open. Geography is at best a secondary factor.