Chinese warplanes flying into Taiwan’s Air Defence Identification Zone (ADIZ) is not new. Nor is the presence of foreign navies sailing warships through the South China Sea. What is new is the number and type of aircraft involved, and the manner of their testing of Taiwan’s defences. As the Taiwanese defence ministry puts it, they “don’t even bother to make excuses anymore”. What is also new is the resolve of multiple nations to push back against China’s increasingly assertive behaviour.