In a drill on Nov. 25, People’s Liberation Army (PLA) aircraft flew once around Taiwan. On Saturday, PLA aircraft were once again engaged in a drill. The Chinese military aircraft not only circled Taiwan’s airspace, they also challenged the US and Japan’s control of the first island chain, and this carries huge strategic and tactical significance. Although all parties maintained their cool and avoided a clash, a war of nerves in the Asia-Pacific region is under way.