The good news here, is that many countries have double taxation treaties. So that you don't get taxed by 2 countries for the same income.
https://en.wikipedia.org/wiki/Tax_treaty
Only to a point. I think the limit is around $100,000.00 nowadays. Anything over that gets taxed by both the country you live in and the U.S. (if you're a U.S. citizen).
FWIW, I would much rather be in the US than Japan if China becomes aggressive. Keep your options open. History is long. Pax Americana may be coming to an end.
I wonder if it would be possible to state "no, I renounced due to not wanting to be associated with Donald Trump" (or, if you're leaning to the Republican side, Barack Obama)...how are they going to prove otherwise?