North Korean leader Kim Jong Un has warned there will be consequences if the United States "continues to break its promises and misjudges the patience of our people".
The North Korean leader did say he was willing to meet Mr Trump again - and said relations can "advance at a fast and excellent pace" if the U.S. eases sanctions and halts joint military exercises with South Korea.
"North Korea is prepared to strike a move, so it is requesting South Korea to actively convince the United Nations and the USA to alleviate or lift sanctions layered upon the state".
Pyongyang has demanded Washington lift sanctions and declare an official end to the 1950-53 Korean War in response to its initial, unilateral steps toward denuclearisation, including dismantling its only known nuclear testing site and a key missile engine facility.
Trump and Kim held an historic summit in Singapore in June, at which Kim said he was committed to denuclearising the Korean Peninsula.
The statement jarred with Seoul's claim that Kim is genuinely interested in negotiating away his nukes and suggested that the North will potentially demand the United States withdraw or significantly reduce the 28,500 American troops stationed in South Korea, a major sticking point in any disarmament deal.
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That resulted in a dramatic detente past year, including three summits with South Korean President Moon Jae-in, and the historic meeting with Trump in June.
A meeting between North Korean officials and U.S. secretary of state Mike Pompeo was cancelled by the North at the last minute in November and has yet to be rescheduled.
Kim did not elaborate on what he meant by "new path".
United States officials say those initial steps were not confirmed and can be easily reversed, and have called for strict sanctions enforcement on the impoverished country until full, verifiable disarmament. Washington stopped some large-scale exercises with Seoul, although smaller drills continued.
Trump shakes hands with North Korea leader Kim Jong Un at the Capella resort on Sentosa Island, in Singapore.
Kim said he was willing to resume without conditions joint projects with South Korea that were frozen due to political tensions and North Korea's weapon tests.
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In the joint declaration, Kim pledged to work towards the complete denuclearization of the Korean Peninsula, while in return, Trump promised to provide certain security guarantees to North Korea.
"Kim Jong Un simply reaffirmed what we already know: that North Korea considers progress on denuclearization conditional on Washington providing sanctions relief", said Mintaro Oba, a former U.S. State Department official who worked on North Korean issues.
Mr Kim congratulated himself on his diplomatic activities during 2018, including meetings with South Korean president Moon Jae-in and Chinese president Xi Jinping.
On the front page of the ruling party's flagship newspaper was Kim touring monuments to capitalism, stepping out of a Chinese jet and smiling while shaking hands with the "imperialist" US president. Kim called for increasing electricity power generation in the country that battles chronic power shortages.
He was willing to meet Trump again at any time, he added, "to produce a result that will be welcomed by the global community". Private analysts have accused North Korea of continuing nuclear and missile development, citing details from commercial satellite imagery.
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