The United States warned Thursday that the danger from North Korea was rising and that Washington was ready for "any eventuality" after flying two nuclear-capable B-2 stealth bombers over ally South Korea.
North Korean leader Kim Jong-Un ordered preparations Friday for strategic rocket strikes on the US mainland and military bases after US stealth bombers flew training runs over South Korea.
A joint South-North Korean industrial complex was operating normally Thursday, officials said, despite Pyongyang severing a military hotline used to monitor movement in and out of the zone.
South Korean President Park Geun-Hye warned North Korea on Tuesday that its only "path to survival" lay in abandoning its nuclear and missile programmes.
North Korea's military put its "strategic" rocket units on a war footing Tuesday, with a fresh threat to strike targets on the US mainland, Hawaii and Guam, as well as South Korea.
The US Friday said it would bolster defenses against a possible North Korean missile strike a week after Pyongyang threatened a "pre-emptive" nuclear attack against its arch-foe.
The United States on Monday slapped sanctions on North Korea's primary foreign exchange bank and four senior officials, upping the pressure on Pyongyang to abandon its nuclear program.
North Korea leader Kim Jong-Un threatened to "wipe out" a South Korean island as Pyongyang came under new economic and diplomatic fire Tuesday from US sanctions and UN charges of gross rights abuses.
South Korean and US troops launched a joint military exercise Monday, prompting an infuriated North Korea, which has threatened both countries with nuclear attack, to sever a hotline with Seoul.
An enraged North Korea responded to new UN sanctions with fresh threats of nuclear war on Friday, vowing to scrap peace pacts with South Korea as it upped the ante yet again after its recent atomic test.
Sanctions against North Korea over its nuclear programme are not "the fundamental way" to resolve the crisis, China's foreign minister said Saturday, days after the UN tightened measures against Pyongyang.
The United States and China will on Thursday seek to tighten the UN sanctions screws on North Korea after its widely condemned nuclear bomb test last month.
South Korea's new president Park Geun-Hye offered a "more flexible" engagement with North Korea on Friday if Pyongyang chooses a path of trust-building rather than provocation.
North Korean leader Kim Jong-Un has overseen a military drill, state media said Saturday, his third such inspection in as many days as tensions run high following Pyongyang's third nuclear test.
US President Barack Obama on Friday pledged with Japan's new leader to take a firm line on a defiant North Korea but the two sides also tried to calm rising tensions between Tokyo and China.
Experts differ about the scale and immediacy of the military threat posed by North Korea's latest nuclear test, but there is little disagreement about the alarming proliferation risks it presents.
South Korea staged a naval exercise involving US surveillance aircraft on Tuesday, flexing its military muscles at a time of high tensions on the Korean Peninsula following the North's third nuclear test.
US Secretary of State John Kerry finally talked Sunday with Russian Foreign Minister Sergei Lavrov, who had been unavailable for days after the North Korean nuclear test.
North Korean defectors in the South launched 200,000 anti-Pyongyang leaflets across the tense inter-Korean border on Saturday, the birth anniversary of the North's late leader Kim Jong-Il.