US President Donald Trump says he is considering five people to replace ousted national security advisor John Bolton, who, he says, was not aligned with his administration's priorities.
The launches came after North Korea said a day earlier that it was willing to restart nuclear talks with the United States in late September.
North Korean leader Kim Jong-un oversaw the test of a "super-large multiple rocket launcher", state news agency KCNA reports.
North Korea fired two "unidentified projectiles" into the sea off its eastern coast, South Korea's military says, the latest in a series of launches by Pyongyang.
North Korea said that inter-Korean talks are over, while reportedly launching at least two projectiles into the sea on Friday.
North Korea fired two unidentified projectiles into the sea, said South Korea, in the latest launch that came shortly after US President Donald Trump said he had received a "very beautiful letter" from North Korean leader Kim Jong Un.
North Korea's latest missile launches were meant as a warning to Washington and Seoul over their joint war games, the North's leader Kim Jong Un said, according to state news agency KCNA.
The launches, the third round of missile launches in a week, were fired off separately from North Korea's eastern coast early Friday, South Korea's Joint Chiefs of Staff told Yonhap.
The test verified the combat effectiveness of the overall system, and North Korean leader Kim Jong-un predicted "it would be an inescapable distress to the forces becoming a fat target of the weapon", state news agency KCNA said.
Thursday's missile tests were the first since Kim and US President Donald Trump agreed to resume nuclear talks during an impromptu meeting last month in the demilitarised zone between North and South Korea.
"We urge the North to stop actions that do not help ease military tensions," said Choi Hyun-soo, a defence ministry spokeswoman for South Korea.
John Bolton is meeting South Korea's chief of National Security Office, defence minister, and foreign minister in Seoul to discuss issues including denuclearisation of the Korean Peninsula and ways to strengthen the South Korea-US alliance.
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