After months of trading insults and threats of nuclear annihilation, President Donald Trump agreed to meet with North Korean leader Kim Jung Un by the end of May to negotiate an end to Pyongyang's nuclear weapons program, South Korean and U.S. officials said Thursday. No sitting American president has ever met with a North Korea leader.

According to My Republica, the meeting would be unprecedented during seven decades of animosity between the U.S. and North Korea. The countries remain in a state of war because the 1950-53 Korean War ended with an armistice and not a peace treaty.

"Great progress is being made," Trump tweeted after the South Korean national security director, Chung Eui-yong, announced the plans to reporters in a hastily called appearance on a White House driveway.

Trump added that sanctions will remain in place until there's a deal.

Trump took office vowing to stop North Korea from attaining a nuclear-tipped missile that could reach the U.S. mainland, a goal that Pyongyang is on the cusp of reaching. He's oscillated between threats and insults directed at Kim that have fueled fears of war, and more conciliatory rhetoric.

The historic announcement comes during a period of unparalleled tumult in the West Wing, with the president's policy agenda stalled and morale sinking as staff departures proliferate and disrupt efforts to instill more discipline and order.

Trump clearly relished the news of the planned summit. He had made a surprise visit to the White House press briefing room on Thursday afternoon to alert reporters of a "major statement" on North Korea by South Korea. When asked by an ABC reporter if it was about talks with North Korea, he replied: "It's almost beyond that. Hopefully, you will give me credit."

Earlier Thursday, Chung had briefed Trump and other top U.S. officials about a rare meeting with Kim in the North Korean capital. During that meeting, the rival Koreas agreed to hold a leadership summit in late April, the first in a decade.

Kim "expressed his eagerness to meet President Trump as soon as possible," Chung told reporters. "President Trump appreciated the briefing and said he would meet Kim Jong Un by May to achieve permanent denuclearization."

The White House said Trump's meeting with Kim would take place "at a place and time to be determined."

It marks a dramatic shift in Trump's stance toward North Korea. He has threatened the pariah nation with "fire and fury" if its threats against the U.S. and its allies continued. He has derided Kim by referring to him as "Little Rocket Man." Kim has pilloried Trump as "senile" and a "dotard."

After Kim repeated threats against the U.S. in a New Year's address and mentioned the "nuclear button" on his office desk, Trump responded by tweeting that he has a nuclear button, too, "but it is a much bigger & more powerful one than his, and my Button works!"