Pyongyang launched an "unidentified projectile" into the East Sea on Monday, Sputnik reported.
A projectile was shot from a site located near the country's Dongchang-ri long-range missile launch center at around 7:36 AM and fell into the East Sea after flying over the country, Seoul's Joint Chiefs of Staff (JCS) said as cited by the Yonhap news agency.
The launch occurred amid the joint drills between South Korean and American militaries, indicating an "apparent" protest from Pyongyang, Yonhap noted.
Ongoing military training exercises between the US and South Korea have reportedly been called a provocation by Pyongyang, and are scheduled to continue through April.
North Korea's nuclear program has been a source for concern for its closest neighbor, South Korea, as well as for the international community. On February 12, Pyongyang launched a medium-range ballistic missile into the Sea of Japan and declared the test successful. This and a number of previous launches were considered to be in violation of the UNSC resolutions by the United Nations.
On February 27, the US informed South Korea and Japan that North Korea may be reinstated to a list of state sponsors of terrorism, after being removed in 2008. The decision was said to be connected to the recent killing of North Korean leader Kim Jong Un’s half-brother, Kim Jong Nam. On Saturday, Pyongyang vowed the US will "pay dearly" for the decision.