Kim Jong Un "sternly" said that "the drill conducted by the (North's) Strategic Force is a curtain-raiser of its resolute countermeasures" against joint military exercises being conducted by the USA and South Korea.
Why has North Korea ramped up its missile tests?
Following North Korea's recent missile launch, President Donald Trump called Japanese Prime Minister Shinzo Abe and said the "US stands with Japan 100%". Experts said the missile had the capacity to reach the USA mainland.
Mattis explained that there is more to diplomacy than dialogue, stating that now is not the time for talks.
In the last two months, Pyongyang has carried out its first two successful tests of an intercontinental ballistic missile (ICBM) apparently bringing much of the United States mainland into range.
In January 1968, the USS Pueblo, a spy ship, is captured by North Korea.
He has long stressed the need to seek a "balance of nuclear power" - or a "balance of terror" - with the North, an idea the Seoul government has dismissed based on its denuclearization and non-proliferation principles.
Moon said all available diplomatic actions, including new UN Security Council resolution, should be considered to completely isolate North Korea in response to the its sixth nuclear device test. He might have assumed that since North Korea didn't drop a missile near Guam - a possibility that arose after Mr. Trump made his "fire and fury" threat three weeks ago from his New Jersey golf course - his work was done, with little more effort than it takes to type a tweet.
The United States flew some of its most advanced warplanes in bombing drills with ally South Korea on Thursday, a clear warning after North Korea launched a midrange ballistic missile created to carry nuclear bombs over Japan earlier this week, the US and South Korean militaries said.
Previous year it fired a missile that came down in Tokyo's exclusive economic zone - waters extending 200 nautical miles from Japan's coast.
A North Korean nuclear test - labeled by experts as the pariah state's most powerful ever - drew rebuke from around the globe, including from North Korea's strongest ally, with several nations joining forces to come up with an appropriate response.
In January 2002, United States president George W. Bush labels North Korea, along with Iran and Iraq, as part of an "axis of evil".
"We absolutely do not tolerate the nuclear and missile development by North Korea".
On August 29, Pyongyang sends a ballistic missile over Japan.
North Korea had earlier threatened to fire a salvo of Hwasong-12s toward Guam, which is home to key US military bases and strategic long-range bombers the North finds threatening.
It is not the first time Pyongyang has declared a death sentence on South Korean citizens.
The UN Security Council has unanimously condemned North Korea for its military actions.
Leader Kim Jong-Un has called for Pyongyang to carry out more missile tests into the Pacific Ocean, and there is no reason not to take him at his word.
The ruling Democratic Party excoriated the North, saying its latest nuclear test is a "self-defeating act". "The prime minister told Prime Minister Abe that the United Kingdom stood shoulder to shoulder with Japan in facing North Korean aggression", the spokeswoman said.
A frustrated Trump took to Twitter to condemn Pyongyang, saying "the U.S. has been talking to North Korea, and paying them extortion money, for 25 years".