Maritime power vs continental power [0]. Trump sees the world from a continental power viewpoint. In the recent past the West used to see, and operate, the world from maritime power point of view. Incidentally, China used to think like a maritime power as well - until Xi became president.
China trades with almost every country in the world-that is maritime power. Since Xi became president China is acting more like a continental power-looking at land expansion at the cost of trade. Granted China did not attack Taiwan yet. Hopefully Xi sees this folly and does not attack Taiwan.
[0] https://www.youtube.com/watch?v=Yf8mCThmsGc