The U.S and China made tremendous progress in bilateral ties during meetings with his Chinese counterpart Xi Jinping, President Donald Trump said.
The talks have been overshadowed by surprise US military strikes against Syria the previous night.
China has called for the resumption of diplomatic talks over the nuclear threat and has objected to the United States deployment of a missile-defence system in South Korea.
Trump would be wise to address China's more aggressive role in the South China Sea, an global body of water that the country has basically claimed as its own in the last few years.
In return, Xi hoped to obtain assurances from Trump on punitive tariffs and the delay of an American arms sale to Taiwan, at least until after a major Communist Party meeting later this year.
According to Spicer, Xi and Trump "reaffirmed their commitment to a denuclearized Korean peninsula, and committed to fully implement UN Security Council resolutions".
After the meeting, Trump took Xi on a walk around the manicured grounds of his lavish Spanish-style complex. The most powerful message for the Chinese leader may have been Trump's decision to launch US missile strikes at Syria.
Trump told Xi about the attack "and explained the rationale behind it", Secretary of State Rex Tillerson said.
The US president has said that if China doesn't exert more pressure on North Korea, the US will act alone. China's proximity to North Korea, both geographically and ideologically, make it the prime candidate to be the nation that can rein in Kim. The former reality TV star has spent years bashing China and described the country as an enemy of the United States in his campaign manifesto.
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Bilateral trade and the threat from North Korea's nuclear ambitions dominated the talks on the first day of their first summit that was overshadowed by the American military action in Syria on Thursday night. They remarked generally about "progress" in their relationship and optimism about the future.
Trump did not explain what differences had been narrowed between the two countries. "The relationship developed by President Xi and myself I think is outstanding", Trump said in contrast to the anti-China rhetoric of his 2016 election campaign.
Beijing has countered USA, claims saying it has imposed United Nations ordered sanctions against Pyongyang, including suspending all coal imports from the country.
Xi, speaking through an interpreter, said the two leaders have "arrived at many common understandings, the most important being deepening our friendship and building a kind of trust in keeping with the Sino-U.S. working relationship and friendship".
Top Chinese leaders exist in a world where public appearances are tightly choreographed, the news media are controlled and protocol is paramount.
Xi expressed his readiness to lead, together with President Trump, people who have good wishes and passion to upgrade China-U.S. relations.
Another matter that didn't come up was the bankruptcy of Westinghouse Electric Co.'s nuclear reactor business.
President Donald Trump says it's been "very interesting" to spend time with Chinese President Xi Jinping and his delegation.
"We have been looking very carefully at that", Ross said. After Tuesday's missile launch by the North, Tillerson issued an unusually blunt statement saying the U.S.
Although China is not implicated in the Syrian war, Trump will have been keen to appear resolute and decisive as the rivals size each other up and spar over trade and North Korea.