North Korea fired at least two projectiles into the sea early Thursday, South Korea's military said without giving details about what type of missiles were launched.

Axar.az reports citing foreign media that the country is banned from testing ballistic missiles by UN resolutions to deter it from continuing to develop rockets as an extension of its nuclear program.

The "unidentified projectiles" were launched into the Sea of Japan, known as the East Sea in Korea, from South Hamgyong province, Seoul's joint chiefs of staff said in a statement.

The South's presidential Blue House said it would convene a national security council meeting to discuss the launches.

Japan, however, suspects that the launch involved two ballistic missiles, making it the first such weapons test during the administration of US President Joe Biden.

"It's been a year since they last launched a missile," Japanese Prime Minister Yoshihide Suga told reporters. "This threatens the peace and security of our country and the region. It is also a violation of the UN resolution."