Because in recent times building a base isn't used to justify ownership of all the surrounding sea's (and where that is done it's because we/they previously owned that island, like the Falklands).
Creating an island out of thin air and then claiming the territory around it is 1 step short of Sealand.
That said no we aren't perfect and we did stuff like this as well but two wrongs in this case don't make a right, this is nothing but a very destabilising move.
Creating an island out of thin air and then claiming the territory around it is 1 step short of Sealand.
That said no we aren't perfect and we did stuff like this as well but two wrongs in this case don't make a right, this is nothing but a very destabilising move.