It's unknown what countries, if any, received the letter besides Australia.
A South Korean lawmaker says hackers stole plans that detailed removing Kim Jong-un, among other things.
Kim Jong-un's younger sister is reportedly a close aide and helps plan his travel and public appearances.
President Trump announced his plan to visit five Asian countries to increase international support to rein in North Korea.
In a statement, North Korea's foreign minister said his country has "every right" to take "countermeasures" against the U.S.
Regime leader Kim Jong-un said President Donald Trump would "pay dearly" for saying the U.S. would "totally destroy" North Korea if needed.
North Korean leader Kim Jong Un called President Donald Trump “deranged” and said in a statement carried by the state news agency…
The Hermit Kingdom is threatening the U.S. and Japan after the United Nations hit the country with new sanctions.
North Korea claims it has successfully tested a missile-ready hydrogen bomb.
We examine how Japan's perception of North Korea has changed over the years, and why the U.S. has an incentive to protect Japan.
North Korea will reportedly conduct another nuclear test soon. But tracking its nuclear program activity is tougher than you think.
North Korea has fired a missile over the island of Hokkaido just as the Japan wraps up military exercises with the U.S.