US diplomatic and defence chiefs met their Chinese counterparts for security talks and pushed China to rein in companies that allegedly deal with its wayward ally North Korea in violation of UN sanctions.
Trump has been counting on China to use its economic leverage with the government of North Korean leader Kim Jong Un as American concern grows over the North's acceleration toward having a nuclear missile that can strike the US mainland.
Defence Secretary Jim Mattis said Trump's commentary "represents the American people's view of North Korea right now. We see a young man go over there healthy and with a minor act of mischief" and come home on the verge of death.
"What you are seeing I think is the American people's frustration with the regime that provokes and provokes and provokes and basically plays outside rules, plays fast and loose with the truth," Mattis told a news conference.
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Their meeting took place against a backdrop of high tensions on the divided Korean Peninsula. On Tuesday, the US flew two supersonic B-1B bombers there in a show of force. South Korea's Defence Ministry said the bombers engaged in routine exercises with its fighter jets aimed at deterring the North.
"China understands that the United States regards North Korea as our top security threat," Tillerson said. "We reiterated to China that it has a diplomatic responsibility to exert much greater economic and diplomatic pressure on the regime if they want to prevent further escalation in the region."
Mattis said China "continues to work these issues." North Korea conducts about 90 percent of its trade through China, which maintains that it implements the U.N. Sanctions properly.
Chinese officials were not immediately available for comment after the talks. Beforehand, China said it was hoping for "positive outcomes" from Wednesday's dialogue. It had long pushed for a resumption of US negotiations with North Korea, which currently appears a remote prospect.
Divisive trade issues will be dealt with at a later date. Like past presidents, Trump is finding the US has limited scope for punishing North Korea, particularly over the arrest of US citizens. Three Americans remain in detention in the reclusive country.
Trump's administration is considering a ban on Americans visiting North Korea. That would only slightly add to the North's isolation and loss of revenue. The route to inflicting significant economic pain on Kim's government remains through China.