South Korea's new President Choe was asked whether Pyongyang is preparing to hold dialogue with the government of new South Korean President Moon Jae-in.
Moon said the missile test violates UN Security Council resolutions and called it a severe challenge to the peace and security of the Korean Peninsula and the world, presidential spokesman Yoon Young-chan said.
North Korea fired a ballistic missile early on Sunday that flew 430 miles, South Korea's military said, days after a new leader took office in the South pledging to engage in dialog with Pyongyang.
"The United States should never expect us to give up our nuclear capability", the main Rodong newspaper said in a commentary carried by the Korean Central News Agency.
The launch took place while Beijing is hosting an worldwide "Silk Road" summit with global leaders, including Russian President Vladimir Putin.
The White House today described a ballistic missile test by North Korea as a provocative behaviour and called for stronger sanctions against Pyongyang. He says Japan and the USA also started discussing the sanctions on North Korea, but did not elaborate.
It wasn't immediately clear what type of ballistic missile was launched, the seventh such firing this year, although the U.S. Pacific Command said that "the flight is not consistent with an intercontinental ballistic missile".
China and Russian Federation have condemned North Korea's missile and nuclear tests, but both countries insist on resuming the stalled six-party talks initiative to solve Pyongyang's nuclear issue.
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South Korea's President Moon Jae-in has strongly condemned the launch, saying there was still the possibility of dialogue with North Korea but that Seoul would deal sternly with any such provocations.
He pointed to worsening relations between Beijing and Pyongyang as the USA has increased pressure on China to act to reign in North Korea's nuclear program.
It also tried out the Moon government's handling of the North's provocation, with many conservatives in the South questioning its capability on the national security front.
In particular, the United States has persuaded China to apply more pressure on its communist neighbor.
North Korea has previously attempted at least nine missile launches on six occasions since US President Donald Trump was inaugurated in January. Russian President Vladimir Putin as well as a North Korean delegation attended the conference.
"Let this latest provocation serve as a call for all nations to implement far stronger sanctions against North Korea".
Japan's Chief Cabinet Secretary Yoshihide Suga says the missile test-fired by North Korea flew 800 kilometers (500 miles) for about 30 minutes and landed in the Sea of Japan, but not inside Japan's exclusive economic zone.
Donald Trump has been briefed on North Korea's latest missile launch and believes Russian Federation must be unhappy with the firing as the missile fell close to the country, the White House said Sunday. Japanese Defence Minister Tomomi Inada said the missile could be of a new type.
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David Wright, co-director of the Global Security Program at the Union of Concerned Scientists, said the missile could have a range of 4,500 kilometers (about 2,800 miles) if flown on a standard, instead of a lofted, trajectory - considerably longer than Pyongyang's current missiles.
While military option against North Korea remains on the table, Washington is also pursuing diplomatic channels to address the issue.
The missile impacted "so close to Russian soil - in fact, closer to Russia than to Japan - the President can not imagine that Russia is pleased", the White House said.
Moon, the first liberal leader in Seoul in almost a decade, said as he took his oath of office that he'd be willing to visit the North if the circumstances were right.
On Saturday, a top North Korean diplomat said it was open to dialogue with the Trump administration under the right conditions.
Kishida says the worldwide community should prioritize efforts to implement the existing U.N. Security Council resolutions barring North Korea's missile and nuclear technology more thoroughly.
Japanese Prime Minister Shinzo Abe condemned the launch in a quick doorstep interview with reporters.
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