Turn it around, how would the American gangsters and the Japanese yakuzas behave when Chinese ships and aircraft get near to their coastal waters or airspace. China should mount similar operations into Guam, Hawaii or the west coast of the USA and see how the American gangsters would react and then use the same reactions/precedents to deal with the American gangsters in the East and South China Seas. Both can play the same game. If the American gangsters dare to take down a Chinese ship or aircraft, China should reciprocate and do the same in the East and South China Seas to the American ships and aircraft.
China is no longer a weak and hapless nation. China can hit back and deal with the Americans confidently in military encounters. The gangsters only understand the language of force like what Putin is doing. Only then would they back off. China cannot adopt a weak and passive stance and let the Americans run all over the East and South China Seas. If the American gangsters think they can fly and sail their warplanes and warships into Chinese territories and waters, China should do the same.
The world is watching what the Americans are doing in the East and South China Seas and also in the Middle East and all over the world. When China did the same, or when Russians did the same, the Americans would have to stuff their shoes into their own mouths. This is the reality of the 21st Century. The American gangsters are not alone to be able to strut their stuff around to bully other nations with impunity.