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During the Cold War, U.S. planes accidentally dropped nuclear bombs on the east coast, in Europe, and elsewhere. "Dumb luck" prevented a historic catastrophe.

Updated 11:22 p.m. ET

President Trump's abrupt announcement he was calling off a June 12 summit with North Korea's leader was met Friday with an open invitation from North Korea to meet "at any time."

Trump's decision, which officials said Thursday was delivered in a letter directed to Kim Jong Un, prompted questions and dismay from world leaders.

Updated: 10:45 a.m. ET

North Korea closed its nuclear test site in spectacular fashion Thursday, blasting the site in what one observer described as a "huge explosion."

Updated at 4:47 p.m. ET

President Trump cautioned that his historic summit with North Korean leader Kim Jong Un may not happen as planned.

"There's a chance, there's a very substantial chance that it won't work out," Trump said during an Oval Office photo op with the president of South Korea. "I don't want to waste a lot of time. And I'm sure he doesn't want to waste a lot of time. So there's a very substantial chance that it won't work out and that's OK. That doesn't mean that it won't work out over a period of time."

USF Center for Strategic and Diplomatic Studies

Tensions between the United States and North Korea grow with every development with the Asian country's nuclear weapons program and with every tweet and response between U.S. President Donald Trump and his counterpart, Kim Jong Un. 

One man who has sat across the table from North Korea's leaders is Christopher Hill, who was U.S. ambassador to a number of countries, including South Korea (2004-05) and Iraq (2009-10). He also was the head of the U.S. delegation to the 2005-07 six-party talks aimed at resolving the North Korean nuclear issue. 

Updated at 3:30 p.m. ET

U.S. Ambassador to the United Nations Nikki Haley tells the U.N. Security Council that North Korean leader Kim Jong Un is "begging for war," with the latest nuclear test that Pyongyang says is its first fusion device, a much more powerful weapon than it has exploded in the past.

"Enough is enough. War is never something the United States wants. We don't want it now. But our country's patience is not unlimited," Haley told an emergency session of the 15-member Security Council in New York.