Soft blackade, that is pointless. And a hard one is basically an escalation to war (see: Cuban Missile Crisis). A country in, maybe, panic mode is not conquere

Soft blackade, that is pointless. And a hard one is basically an escalation to war (see: Cuban Missile Crisis). A country in, maybe, panic mode is not conquered. And if said island is strategically important enough, yes, people will go to war over it. And if it isn't, there is no real point beyond symbolism to take it in the first place.