There will "eventually be a success" against Pyongyang, Trump said. Other displays had been planned long in advance.
Early last week, North Korea successfully tested an ICBM, their first success ever.
"Something has to be done about it", Trump said as he met with Chinese President Xi Jinping.
The President also addressed trade issues before his meeting with Xi.
Pyongyang will not negotiate with the United States to give up those weapons until Washington abandons its hostile policy against the North, KCNA quoted Kim as saying.
"We stand ready to provide [military] options if they are necessary".
North Korean leader Kim Jong Un visited a mausoleum honoring state founder Kim Il Sun on Saturday, the anniversary of his grandfather's death, the North's official KCNA news agency reported.
"We have not given up hope", Tillerson said.
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China will not solve North Korea. "At least I know China tried!"
"It's an honour to have you as a friend", Trump told Xi, telling him he appreciated actions he had already taken on North Korea. He continued: "I think there were substantive discussions about the financing of North Korea, we had substantive discussions about ways of dealing with North Korea together". Unlike the United States, which has not ruled out a military solution to the crisis, Russian Federation and China have offered a peaceful resolution that would avoid placing further sanctions on the North Korean regime. But before that happens, we should be in for some interesting attempts at inter-Korean diplomacy - still preferable to the ultimate alternative of a war that nobody wants and could spread through the region.
U.S. commanders said the mission, part of which took place near the Demilitarized Zone (DMZ) separating North and South Korea, was to show force to Seoul's neighbor and demonstrate "the ironclad United States commitment to our allies", according to AP.
Pyongyang warned it would be a "piece of cake" to destroy "gangster" South Korea, state media reported Thursday, as it raged against Seoul for a joint missile drill with the U.S. following its landmark intercontinental ballistic missile (ICBM) test.
"Our experience with China has been. a bit uneven", Tillerson said Friday. "Diplomatic efforts remain under way as we speak".
As a nation based on peace and harmony, Japan finds itself in a precarious position when it comes to threats by North Korea.
Far from pulling out their stilettos, jabbing one another with sly innuendos if not full-frontal attacks, Trump and Moon agreed in two days of talks in Washington that South Korea should take the lead in negotiations with North Korea.
"China will be allowed to build hundreds of additional coal plants".
Late on Thursday, court filings made public disclosed that USA authorities were trying to seize millions of dollars from companies that deal with North Korea, including the country's military, from eight large worldwide banks.