Angered by U.N. Security Council sanctions over its nuclear test, North Korea threatens for the first time to launch a pre-emptive nuclear strike against the United States and South Korea.
It's one of a series of provocative threats and, in some cases, actions by North Korea that begins with Pyongyang saying it is scrapping the 1953 truce that effectively ended the Korean War. At the same time, it cuts off its direct phone links with South Korea at Panmunjom, the abandoned village that sits on the border between the two countries.
North Korea then doubles down on the threat, saying it is nullifying the joint declaration on the denuclearization of the Korean Peninsula. One of the country's top generals, according to published reports, claims Pyongyang has nuclear-tipped intercontinental ballistic missiles that are ready to be fired.
Although U.S. officials don't believe North Korea is in a position to strike the United States, the Obama administration responds to the threat by announcing plans to deploy additional ground-based missile interceptors on the West Coast.
U.S. officials also say B-52 bombers are making flights over South Korea as part of annual, joint military exercises this month that have enraged North Korea.
Pyongyang releases a new propaganda video that shows an imaged missile attack on U.S. government buildings in Washington, including the White House and the Capitol. The roughly four-minute video is posted on the YouTube channel of the North Korean government website Uriminzokkiri.
North Korea threatens Tuesday to attack U.S. and South Korea bases, putting its troops on alert. It announces through state-run media that the military is ready for combat. The threat follows claims that U.S. B-52 bombers again made flights Monday over South Korea.