North Korea has reportedly fired two short-range missiles from its eastern coastal city of Wonsan early on Thursday.
“The missiles flew about 430km (267 miles) from the point of launch and reached an altitude of 50km (30 miles) before falling into the East sea,” an official at South Korea's defence ministry was quoted as saying by Reuters.
“According to initial information, at least one short-range projectile was fired from North Korea. Further analysis is underway,” a US official said.
On Tuesday, North Korean leader Kim Jong Un inspected a “massive, newly-built submarine.” He was accompanied by missile programme leaders, Pyongyang-based news agency KCNA reported.
Speculations are rife that the large submersible could have been developed under submarine-launched ballistic missile (SLBM) programme.
US President Donald Trump and Kim held denuclearisation talks in the end of June, which had stalled after a second summit in February between the leaders in Vietnam broke down.
Although the two countries vowed to hold a new round of working-level talks after the June meeting, Pyongyang has castigated Washington for the upcoming US-South Korea military drills.
However, Cho Yoon-je, South Korean ambassador to the US said that Washington has offered to discuss the time and location of such talks but there was no response from Pyongyang yet.