Guam, although that matters even less to us than Puerto Rico.
Our impotence there would be a tad embarrasing, tho.
More importantly, however, is S Korea and Japan, as well as the rest of Asia, and we DO care about them, albeit for strategic reasons and treaties and cherished alliances,,,
We didn't turn them countries into two of the richest on Earth just so that they can be used for target practice.
Don't forget N Korea is a proxy state of China, and also has links to Russia (The Korean War was a thing for a reason), and them two countries own our balls.