North Korea has reportedly fired multiple short-range cruise missiles into the sea on Tuesday.
South Korea's military announced that the missiles flew about 150 km between the Korean peninsula and Japan.
Several military aircraft also appeared to have been involved in the drill, it said, adding that it is conducting more analysis of the launch.
It's the latest in a series of military drills the country has been indulging in. Just last month, it fired nine ballistic missiles in four rounds of tests.
According to reports by the North Korean state media, leader Kim Jong Un had visited an airbase and observed drills by the country's fighter jets on Sunday.


Fire in rebel-held east Congo kills 24 schoolchildren
Trump touts $5,000 payout if Republicans win as Vance waits in wings
Search expands after Philippine ferry fire kills five and leaves dozens missing
Trump says Iran war to end after US midterm elections
At least 20 killed in cargo vessel fire at China shipyard, state media reports
