North Korea fired two unidentified missiles on Monday, the southern military said weeks after Pyongyang declared a moratorium on long-range missile testing.
The two planes were fired east over the sea from the Wonsan region on the east coast, said the Joint Chiefs of the South.
“The military is monitoring the additional launches and is standing by,” the statement added.
The North carried out a series of weapons tests late last year, the last in November, often describing them as multiple rocket launch systems, although others have called them ballistic missiles.
He also performed static engine tests, most recently in December.
At a party meeting later this month, leader Kim Jong Un said Pyongyang no longer saw itself as bound by its moratoria on testing nuclear and intercontinental ballistic missiles, and threatened to demonstrate soon ‘a “new strategic weapon”.
The move came with stalled nuclear talks with the United States, and as a unilateral delay, Pyongyang asked Washington to offer further concessions on easing sanctions.
Pyongyang has already fired missiles capable of reaching the entire American continent and has carried out six nuclear tests, the last of them 16 times more powerful than the Hiroshima explosion, according to the highest estimates.
He has been the subject of several rounds of sanctions on his weapons programs by the United Nations Security Council, the United States, the South and other bodies.
Increased tensions in 2017 were followed by two years of nuclear diplomacy between Pyongyang and Washington, including three meetings between Kim and U.S. President Donald Trump, but little tangible progress has been made.