Earlier, after discovering "great chemistry" with Chinese President Xi Jinping over "the most beautiful piece of chocolate cake" at Mar-a-Lago, Trump had confided, "I explained … that a trade deal with the U.S. will be far better for them if they solve the North Korean problem!"

"America First" thus takes a back seat to big-power diplomacy with Beijing. One wonders: How much will Xi end up bilking us for his squeezing of Kim Jong Un?

Trump once seemed to understand how America had been taken to the cleaners during and after the Cold War. While allies supported us diplomatically, they piled up huge trade surpluses at our expense and became virtual free-riders off the U.S. defense effort.

No nations were more successful at this than South Korea and Japan. Now Xi is playing the game – and perhaps playing Trump.

What is the "North Korean problem" Beijing will help solve in return for more indulgent consideration on future U.S.-China trade deals?