On the first point, his 2017 article on secretary of state Dean Acheson’s “infamous” speech made in January 1950 leading to the Korean war is highly instructive. In his speech, Acheson appeared to exclude the Republic of Korea (South Korea) and Republic of China (Taiwan) from the US defence perimeter that extended from Japan’s Ryukyu Islands to the Philippines.

That led Stalin, Mao and Kim Il-sung into the mistaken belief that it was open season on South Korea. Acheson later defended himself, saying Australia and New Zealand weren’t included in the defence perimeter but clearly, the US would come to their defence against any communist aggression.

This “unfortunate” lesson from Acheson, on Yu’s telling, is that the United States must signal unambiguously that China’s aggression in the Asia-Pacific today will not be tolerated. This leads to his second conclusion: conflict is all but inevitable.

China regards much of the East and South China seas as its “backyard”. For Yu, the US must make it crystal clear that such a “revisionist” order will not be tolerated.

“China’s geopolitical and geostrategic priority is to revise or change the existing international order that has been based upon a complex system of rules, laws and customs that govern various global commons including the South China Sea,” he said in a recent interview with Foreign Policy. “Revisionism brings unavoidable confrontation.”

According to the Trump administration, previous presidents tried both sticks and carrots with China.

But for Yu and his boss Pompeo, only the stick will work with Beijing.

Now that’s a scary thought – when America’s top diplomat is not seeking diplomatic solutions but readying for war.