North Korea fired two ballistic missiles on Wednesday, a day after Pyongyang and Washington announced they would resume nuclear talks.
One of the projectiles fell into waters within Japan’s exclusive economic zone, Tokyo said.
According to South Korea's military officials, the projectiles were fired from Wonsan into the East Sea (Sea of Japan).
South Korea's National Security Council placed "weight on the possibility" that it was a submarine-launched ballistic missile (SLBM).
"Such actions by North Korea to raise tensions are not helpful to efforts to ease tensions on the Korean peninsula and we urge it again to stop immediately," the South’s Joint Chiefs of Staff said.

Keiko Fujimori declared winner of Peru presidential race
Ukrainian rescuers clear rubble as Kyiv mourns 30 killed in Russian attack
Monaco blast suspect is a Ukrainian woman who fled to Germany
Clinical trials begin for two potential Ebola treatments
India issues notice to Telegram, Signal on concerns over usernames, source says
Blast at Damascus cafe kills nine, wounds 20
Rebels in Indonesia's Papua kill American pilot, burn plane
Russian air strikes kill 10, injure more than 50 in Ukraine's Kyiv
