North Korea's moves were likely a pressure tactic and it's unclear how they will affect ties with South Korea since cross-border travel and exchanges have been halted for years.

Kim Jong Un reiterated that North Korea would "without hesitation" use its full attack capabilities if South Korea employed armed forces against it. This warning comes amid growing concerns over North Korea's expanding security ties with Russia.

North Korea 's deepening ties with Russia have caused alarm among Western powers. Kim sent Russian leader Vladimir Putin a message to celebrate his 72nd birthday this week, describing the Kremlin warlord as his “closest comrade” and said the bonds between their two countries are “invincible and eternal.”

North Korea says leader Kim Jong Un has threatened to use nuclear weapons and destroy South Korea permanently if provoked

North Korea's Kim Jong Un said he will speed up steps toward a military superpower and strong nuclear power, South Korean news agency News1 reported on Tuesday.

North Korean leader Kim Jong Un threatened to use nuclear weapons to destroy South Korea if attacked, state media reported Friday, after South Korea’s president warned that if the North used nuclear weapons it would “face the end of its regime.

North Korean leader Kim Jong Un warned again that he could use nuclear weapons in potential conflicts with South Korea and the United States, as he accused them of provoking North Korea and raising animosities on the Korean Peninsula,

South Korean media reported on Tuesday that the country's military has detected signs of the nuke-capable North Korea starting to construct a submarine powered by a nuclear reactor. Kim Jong Un, the supreme leader of North Korea,

The development would be in line with previous reports and follows the launch, last September, of a reworked Cold War-era Romeo class diesel-electric submarine designed to carry ballistic missiles. “Partial signs that appear to be the start of the submarine’s construction have been detected,

The military has detected apparent signs that North Korea has started to build a possible nuclear-powered submarine, a lawmaker said Tuesday, amid concerns over Pyongyang's push to acquire advanced weapons.