U.S. shows it is the champion of international law, by sanctioning the International Criminal Court
Interesting action when it considers a court to be outside its jurisdiction.
I will say, it's quite a bold claim to say warcrimes aren't the business of the International Criminal Court. Best of luck on that debate position.
On the flipside, it is basic fact that UNCLOS has nothing to do with sovereignty claims. Fact check this statement as many times as you like: UNCLOS doesn't determine sovereignty claims, it isn't an authority on what counts, and many ratification statements make clear it's inability to prejudice, affect, or supersede pre-existing claims.