31 July, 2017
His comments came a day after Pyongyang test-fired its second intercontinental ballistic missile (ICBM) in a month.
This July 28, 2017 picture released from North Korea's official Korean Central News Agency (KCNA) shows North Korea's intercontinental ballistic missile (ICBM), Hwasong-14 being launched at an undisclosed place in North Korea.
"However, we have a responsibility to our allies and our nation to showcase our unwavering commitment while planning for the worst-case scenario".
For all its bluster and over-the-top propaganda, North Korea often does just what it says it will do when it comes to its weapons development.
US President Donald Trump called it "only the latest reckless and unsafe action by the North Korean regime".
Trump also said he will no longer allow North Korea to continue with its belligerent behaviour.
Beijing's ministry of foreign affairs said in a statement on Saturday: "China expresses serious concern about the actions of the Republic of Korea".
"The UN Security Council has clear regulations on North Korea's launch activities that use ballistic missile technologies", Chinese Foreign Ministry spokesperson Geng Shuang had said in a statement.More news: West Nile confirmed in mosquitoes in New Orleans
The U.S. has in the past used overflights of the supersonic B1-B "Lancer" bomber as a show of force in response to North Korean missile or nuclear tests.
The Hwasong-14 ICBM, which the North first tested on July 4, is the highlight of several new weapons systems Pyongyang launched this year.
David Wright of the USA -based Union of Concerned Scientists wrote in a blog post that if it had flown on a standard trajectory, the missile would have had a range of 10,400 km (6,500 miles).
South Korea's Joint Chiefs of Staff said the missile reached an estimated height of 3,700 kilometers (2,300 miles) before landing at sea about 1,000 kilometers (625 miles) away.
It said the mission was a response to consecutive ICBM tests by North Korea this month.
In response, the USA and South Korean military conducted a live-firing exercise using surface-to-surface missiles, a United States defence official said.
Having a working "nuclear strategic force" would also allow the North to introduce doubt into the U.S. South Korean Defense Minister Song Young-moo called for the deployment of strategic U.S. military assets which usually means stealth bombers and aircraft carriers as well as additional launchers of an advanced United States anti-missile system.
The agency said that the test confirmed important features of the missile system, such as the proper separation of the warhead and controlling its movement and detonation after atmospheric re- entry.
"The successful ICBM test-fire is another great victory which dealt a heavy blow to the USA imperialists and its vassal forces keen on obliterating the DPRK's [the Democratic People's Republic of Korea] dignity and its right to existence", Kim Yu Chol, a researcher of the State Academy of Sciences, told KCNA.
Moon's dovish views on North Korea make it likely he will oppose a US missile strike on North Korea.