Cyprus isnt. There are two sovereign base areas of Cyprus which are overseas U.K. territories, I guess similar to midway.
Islas Malvinas are Argentinian.
[says who?]
Argentina has tried to prove this both by legal means and by force, and has conclusively failed at both, so I think it's well past time to give up.
Not in these three fairly important ways: actual control, the wishes of the people who actually live there, de jure recognition by most countries. Otherwise, sure, totally and wholly Argentinian.
I've got another one: historically
Yeah well... thats what england used to do, invade, put their own people to live there and then ask them if they feel like beloging to the crown.