It was ABSOLUTELY NOT coincidental that China sent a low level trade delegation to the U.S. at exactly the same time U.S.T.R. Lighthizer is conducting open hearings on Section 301 national security trade issues; which are specifically targeted toward China.
For the second time POTUS is using strategic deployment of sunlight on the relationship between Beijing and North Korea. President Trump is highlighting what has been hidden for decades. China has structured the use of North Korean nuclear ambitions as the sword of Damocles over their economic adversaries in the West. China’s Chairman Xi Jinping controls the government officials that surround North Korea’s Chairman Kim Jong-un:

These tweets, along with the earlier tweet. are serious business. They are being fired directly into the heart of Beijing. They are the mother of all truth bombs, and they take away the ability of Chairman Xi to deploy the hidden threat and DPRK control.
“Subtle” like a brick through a window. [More backstory available here.] President Trump is removing the Panda mask to reveal the authentic nature of Chairman Xi Jinping. Simultaneously Trump is trying to rescue Kim Jong-un from the clutches of the Red dragon behind the panda mask.
http://theconservativetreehouse.com/2018/08/24/second-time-president-trump-removes-dprk-panda-mask-to-expose-red-dragon-influence/#more-153232

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.