Two missiles have been fired by North Korea into the sea.
According to South Korea's military, the most recent launch involved short-range ballistic missiles.
It comes after Donald Trump announced that he had received a "very beautiful letter" from Kim Jong-un.
The US President said the North Korean leader wanted the ongoing join military exercises between the USA and South Korea to stop.
According to reports, the missiles were launched from near the eastern city of Hamhung in South Hamgyong Province.
They landed in the Sea of Japan to the east of the Korean peninsula.

FBI foils "terror plot" targeting Los Angeles
Hong Kong court finds tycoon Jimmy Lai guilty in landmark security trial
Ukraine peace talks stretch into second day at start of pivotal week for Europe
Flash floods kill at least 37 people in Morocco's Safi province
'Hero' who disarmed Bondi gunman recovering after surgery, family says
