Trump faces off against an increasingly hostile China at G20

With North Korea launching yet another ballistic missile that landed in waters near Japan, U.S. President Donald Trump called on China to take action and "end this nonsense once and for all!"

After the keenly watched Trump-Xi Jinping summit in Mar-a-Lago on April 7, secretary of state Rex W. Tillerson had said that the two leaders had agreed that North Korea's nuclear development had reached a serious stage.

"Meanwhile, bilateral relations have also been affected by some negative factors, for which the China side has expressed its position to the United States side". A South Korean group, the Korea International Trade Association, said on Monday that North Korea had exported as much iron to China in the first five months of 2017 as it did in all of 2016.

As he flew to Poland on Air Force One, Trump spoke by phone about the North Korean threat with Egyptian President Abdel Fattah el-Sisi, emphasizing the need for countries to implement U.N. Security Council resolutions.

"Both leaders reaffirmed their commitment to a denuclearized Korean Peninsula", the White House said in a readout of the phone call.

"Trump had a bad hand dealt to him after 25 years of failure", Bolton said. Japan's Nikkei 225 closed the day up 0.25%, and South Korea's KOSPI actually climbed 0.33%. "China said the trade grew even as it stopped buying North Korean coal", it reported.

It's unclear whether any of those issues will come up in discussions at the G-20 summit in Germany this week, at which Trump and Xi are expected to hold a bilateral meeting.

Mr Trump and his top advisers have done little to hide their irritation over what they see as the reluctance by China, North Korea's main economic partner, to tighten the screws on Pyongyang over its nuclear and missile programmes. There are a host of topics that are creating problems between the two nations, and China has been more vocal about its discontent with the United States in recent weeks.

Abe praised Trump for the recent USA sanctions on the small Bank of Dandong over its alleged support for North Korea's nuclear program, according to Japanese Chief Cabinet Secretary Yoshihide Suga.

Last week, China's foreign ministry protested to the US over a planned sale of $1.42 billion in military weapons to Taiwan.

Relations between China and the United States had warmed up after the two leaders met in February, with Trump even describing Xi as a "terrific person".

The Trump administration hasn't given up hope China will change course and step up pressure on North Korea, officials said.

A White House announcement did not say what Trump would discuss with Japanese Prime Minister Shinzo Abe and Chinese President Xi Jinping. China is now the world's second-largest economy, it holds trillions of dollars in US debt and its companies are increasingly tied financially with the West.

"The G-20 summit will provide another chance for President Xi and Trump, who have already established good personal relationship, to catch up and maybe fix things a bit". "Why should we continue these deals with countries that do not help?"

The White House statement was more reticent, saying only that the two leaders discussed a range of issues of mutual interest, including North Korea and trade relations, CNN said.