North Korea tested 23 missiles last year, including a missile capable of reaching the United States mainland.
North Korean leader Kim Jong said he would "refrain" from further nuclear or missile testing in a historic message to US President Donald Trump.
South Korea's chief envoy, and head of its national security office Chung Eui-yong, met with Kim earlier this week in Pyongyang, and relayed a message from Kim to Trump on Thursday.
"In our meeting, North Korean leader Kim Jong Un said he is committed to denuclearization," said Chung. "Kim pledged that North Korea will refrain from any further nuclear or missile tests."
Chung also highlighted that North Korea appears to have abandoned its previous stance on missile tests, which were often conducted after military drills on the Korean Peninsula which Pyongyang saw as acts of aggression.
"He understands that the routine joint military exercises in the Republic of Korea and the United States must continue. He expressed his eagerness to meet President Trump as soon as possible."
But Kim's willingness to pause parts of North Korea's weapons program may not actually be that surprising.
In September 2017, Pyongyang conducted its sixth nuclear test shortly after state media ran pictures of Kim inspecting what was reported to be a hydrogen bomb.
And all up last year, North Korea tested 23 missiles and, in November, launched its most powerful missile ever, the Hwasong-15. Mathematically, it is possible for that missile to reach the United States mainland.
After the launch Kim announced the country had "finally realized" its goal of becoming a "state nuclear force." At the time South Korea announced "there is a high chance North Korea will refrain" from provocations "for a while."
North Korea does not appear to have launched a missile since.
Trump said he would meet Kim as soon as this spring "to achieve denuclearization," but the White House later said that a time and date had yet to be determined.