North Korea launched a ballistic missile Sunday (North Korea time) that flew about 700 kilometers (435 miles), South Korea's military said.
Choi did not elaborate on what the North's conditions are, but her comments raise the possibility of North Korea and the US returning to negotiations for the first time since 2008, when six-nation talks over Pyongyang's nuclear weapons program fell apart.
"The South and US are analysing more details about the missile", it said in a statement without elaborating.
An undated file photo released by the North Korean Central News Agency on 7 March 2017 shows four projectiles during a ballistic rocket launching drill at an undisclosed location.
It wasn't immediately clear what type of ballistic missile was launched, although the U.S. Pacific Command said that "the flight is not consistent with an intercontinental ballistic missile". Prime Minister Shinzo Abe told reporters Sunday that the launch is "absolutely unacceptable" and that Japan will respond resolutely.
Abe said Japan will stay in close touch with the United States and South Korea.
North Korea is believed to be developing an ICBM.
Japan Chief Cabinet Secretary Yoshihide Suga declined to comment when he was asked whether the latest missile launch was a success, and whether it represented a new level of threat.More news: Melissa McCarthy's Sean Spicer Rage-Rolls Through NYC Streets
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North Korea has previously attempted at least nine missile launches on six occasions since U.S. President Donald Trump was inaugurated in January. The paper also called on South Korea and the U.S.to stop conducting joint military exercises.
After another diplomatic crisis last month triggered by North Korean missile tests, Trump warned there was a possible "major, major conflict" brewing with Pyongyang, but said he hoped for a diplomatic solution to the dispute over the North's nuclear and missile programs.
"The North is apparently trying to test Moon and see how his North Korea policy as well as policy coordination between the South and the United States will take shape", said Yang Moo-Jin, professor at the University of North Korea Studies in Seoul.
Kim Hak Song was the latest American Christian arrested by North Korean authorities while teaching at the foreign-funded Pyongyang University of Science and Technology (PUST).
Australia has condemned North Korea for its latest test, calling it "reckless and provocative". But she said more analysis was needed.
Two weeks earlier, North Korea tested a ballistic missile that failed nearly at launch.
The Trump administration has called on China to apply more pressure to the North Korean regime.