North Korean leader Kim Jong Un on Wednesday reportedly said his country's nuclear weapons program is not up for negotiation.

In the wake of a high-profile North Korean missile launch, Kim said his country would "demonstrate its mettle to the U.S.," The Associated Press reported.

A state media report said Kim told “scientists and technicians that the U.S. would be displeased to witness [North Korea's] strategic option” on July 4.

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Kim “stressed that the protracted showdown with the U.S. imperialists has reached its final phase and it is the time for [North Korea] to demonstrate its mettle to the U.S., which is testing its will in defiance of its warning," according to the AP.

North Korea claimed earlier this week it launched its first intercontinental ballistic missile (ICBM).

Pyongyang claimed the long-range weapon could "reach anywhere in the world."

After that test, President Trump said he hoped China would "put a heavy move" on North Korea and "end this nonsense once and for all!"

"North Korea has just launched another missile. Does this guy have anything better to do with his life?" Trump tweeted earlier this week. "Hard to believe that South Korea and Japan will put up with this much longer. Perhaps China will put a heavy move on North Korea and end this nonsense once and for all!"

Trump in a tweet on Wednesday, however, pointed to a trade increase between Beijing and Pyongyang.

"So much for China working with us — but we had to give it a try!" he tweeted.

Secretary of State Rex Tillerson on Tuesday called for “global action” to stop North Korea.

Tillerson condemned the missile launch in a statement, saying “testing an ICBM represents a new escalation of the threat to the United States, our allies and partners, the region, and the world.”