Story highlights The South Korean military says North Korea launched the five projectiles Monday

The launch comes just days after Pyongyang fired ballistic missiles

The U.S. and South Korean militaries are conducting annual joint exercises in the region

(CNN) North Korea fired five short-range projectiles from the country's east coast Monday, South Korean military heads said, the latest in a series of actions by Pyongyang to raise tensions on the divided peninsula in recent months.

The projectiles were fired from an area south of Hamhung city, South Hamgyong province, on the country's east coast, between 3:19 and 4:05 p.m. South Korean time (2:19 to 3:05 a.m. ET) Monday, according to the South Korean Joint Chiefs of Staff, or JCS.

The JCS had previously reported the launch of four projectiles.

The projectiles flew about 200 kilometers (124 miles) toward the sea to the east of the Korean Peninsula, the JCS said in a statement.

The South Korean military is closely monitoring the situation and is maintaining full readiness, the statement added.