Saying the Chinese military was “ambitious” but “very inexperienced”, Sir Richard said if a Chinese commander locked onto a US aircraft with its fire-control radar, this would be perceived as an offensive act.

"What if that American commander isn't so confident that he just chins it off, if he launches his missile in response, which under self-defence he's entitled to do? And sinks a Chinese ship? Where does that take us?” he said.

"Wars generally start for really bad reasons and the red mist descends and you lose control … I think the risk of that is evident."

I don't like Trump (read my comment history if you need proof) but in this case I'm going to defend him: if that happens, there will be a Chinese ship on the bottom of the ocean, and if war happens as a consequence of that, it will most likely be a short war in which both sides want to make peace as soon as possible. The US will most likely come out on top with a boost to its prestige and the PRC will be set back.