Kim Jong Un

Updated at 4:40 p.m. ET

President Trump has called off a highly anticipated June 12 summit with North Korean leader Kim Jong Un.

"Sadly, based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long planned meeting," Trump wrote in a letter to Kim.

Updated at 11:10 a.m. ET.

North Korean leader Kim Jong Un hosted a dinner to welcome delegates from South Korea on Monday, in a visit Seoul hopes will pave the way for talks between North Korea and the United States.

The 10-member delegation includes a top national security adviser and spy chief — marking the first time South Korean officials are reported to have met the North Korean leader since he took power in 2011.

North and South Korea have just held their first high-level meeting in two years to discuss the North's participation in the upcoming Pyeongchang Winter Olympics. These talks follow months of tension and escalating rhetoric over the North's continued nuclear and ballistic missile tests. Since his inauguration in May, South Korean President Moon Jae-in has sought to engage with the North, and when Kim Jong Un finally opened the door to negotiations last week, the South eagerly agreed.

Updated at 1:55 a.m. ET

President Trump and North Korean leader Kim Jong Un are once again publicly comparing the size of their respective nuclear arsenals, with the president tweeting that the U.S. "nuclear button" is "much bigger & more powerful" than the one controlled by Pyongyang.

In his annual New Year's address on Monday, North Korean leader Kim Jong Un warned the United States that his country's completed nuclear arsenal is now a button-push away.

"The U.S. should know that the button for nuclear weapons is on my table," he said, according to the Associated Press translation, in a speech carried by state television. "The entire area of the U.S. mainland is within our nuclear strike range. ... The United States can never start a war against me and our country."

The weekend saw an escalation in the war of words between Washington and Pyongyang, complete with a U.S. show of military might over the waters near North Korea and jitters over what seismologists say was an earthquake near a North Korean nuclear test site.

Updated at 2:45 p.m. ET

President Trump delivered a stern warning to North Korea's leader at the United Nations General Assembly Tuesday.

The blast was picked up by seismic stations all over the world, and it was big.

Updated at 4:00 p.m. ET Sunday:

North Korea claims it has again tested a hydrogen bomb underground and that it "successfully" loaded it onto the tip of an intercontinental ballistic missile, a claim that if true, crosses a "red line" drawn by South Korea's president last month.

In a state media announcement, North Korea confirmed the afternoon tremors in its northeast were indeed caused by the test of a nuclear device, and that leader Kim Jong Un personally signed off on the test.

Updated at 6:50 p.m. ET

"Military solutions are now fully in place, locked and loaded, should North Korea act unwisely," President Trump said on Friday, in his latest salvo in the exchange of rhetoric with the isolated regime.

Trump added, "Hopefully Kim Jong Un will find another path!"

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