If confirmed, a submarine-based missile functionality would change the army stability on the Korean peninsula. On Thursday, the United Nations expressed hope that Pyongyang would re-engage in its negotiations on denuclearization with Washington.
Although Kim and and US President Donald Trump have a "special" relationship, "Washington political circles and DPRK policy makers of the US administration are hostile to the DPRK for no reason", a North Korean statement on KCNA said last month.
Pyongyang's official Korean Central News Agency described the tests in a report Friday after the South Korean and Japanese militaries said they detected two North Korean projectiles being fired into the sea on Thursday.
Seoul's Joint Chiefs of Staff said the weapons were fired from an area near the North Korean capital of Pyongyang and flew about 370 kilometers across the country at a height of up to 90 kilometers before landing off its eastern coast.
The test comes weeks after North Korea blamed the United States for derailing the latest bilateral talks by employing an "old viewpoint and attitude" towards the country.
Kim Eun-han, spokesman of Seoul's Unification Ministry, said South Korea has "strong concern" over the North's weapons activity, but avoided a straightforward answer when asked about the possible impact on inter-Korean dialogue.
The US and its allies, Japan and South Korea, condemned the missile launches, saying that they escalate tensions in the region. This was the first time North Korea had conducted live-fire missile testing in nearly a month.
The pair met in Hanoi in February, but no deal was reached.
There is a December 31, 2019 deadline for arms limitation talks between North Korea and the U.S.to move forward.
The meeting had been meant to build on their high-profile first summit in Singapore past year, when Kim signed a vague pledge to work towards "denuclearization of the Korean peninsula".
Earlier this month, the North test-fired an underwater-launched ballistic missile for the first time in three years.
After the breakdown in Sweden, North Korea released a series of photos showing Kim riding a white horse to a snow-covered Mount Paektu, a volcano considered sacred by North Koreans and a place where the leader has often visited before making key decisions.