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.

Thailand continues Cambodia strikes despite Trump's ceasefire claim
EU agrees to indefinitely freeze Russian assets, removing obstacle to Ukraine loan
Severe floods force mass evacuations in US state of Washington
At least 30 killed in Myanmar after junta airstrike hits hospital
Tsunami advisory lifted after earthquake hits Japan's northeast
