Weeks after threatening to deliver an unpleasant “Christmas gift’’ that never materialized, North Korean leader Kim Jong Un says he’s ready to take “shocking actual action.’’

Frustrated with the slow pace of nuclear-disarmament negotiations with the U.S. that may bring his country relief from economic sanctions, Kim warned that he’ll soon unveil a new strategic weapon.

North Korea’s state media reported Wednesday that Kim made the comments during a four-day meeting of the ruling Workers’ Party in the capital city of Pyongyang, where he said the secretive country will never give up its security for economic benefits as it faces what Kim described as increasing U.S. hostility and nuclear threats.

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However, Kim left the door open for further talks and did not indicate any intention of lifting a moratorium on testing of nuclear weapons and intercontinental ballistic missiles.

“He said that we will never allow the impudent U.S. to abuse the DPRK-U.S. dialogue for meeting its sordid aim but will shift to a shocking actual action to make it pay for the pains sustained by our people so far and for the development so far restrained,” the Korean Central News Agency said, referring to the North by its formal name, the Democratic People’s Republic of Korea.

Kim and President Donald Trump have met three times, most recently at the Korean Demilitarized Zone on June 30, when Trump became the first American president to set foot in North Korea. He has consistently framed the negotiations in positive terms, but no concrete agreements have been reached.

The North has been seeking improved terms in the talks since a February summit in Hanoi between the two leaders yielded no progress. Officials from both countries met in Sweden in October in an attempt at restarting negotiations, but that effort failed as well, with North Korea accusing the U.S. of sticking to its old ways.

Vase or missiles? US awaits Christmas 'gift' from North Korea's Kim

In early December, the North Koreans expressed their impatience with what they regard as U.S. stalling tactics, warning of the “Christmas gift’’ if talks did not resume by the end of the year.

With 2020 mere hours away, Kim is making his voice heard again.

“If the U.S. persists in its hostile policy toward the DPRK, there will never be the denuclearization on the Korean Peninsula and the DPRK will steadily develop necessary and prerequisite strategic weapons for the security of the state until the U.S. rolls back its hostile policy,” Kim said, according to the agency.

Contributing: John Bacon and William Cummings, USA TODAY; The Associated Press