North Korea's Korean Central News Agency released on Oct. 3 a photo of their submarine-launched ballistic missile Pukkuksong-3. Yonhap

North Korea fired two unidentified projectiles toward the East Sea on Thursday, South Korea's Joint Chiefs of Staff (JCS) said, amid a lack of progress in denuclearization talks with the United States and chilled inter-Korean ties.

"The projectiles were fired from areas in South Pyongan Province in the afternoon," the JCS said in a brief release, adding, "Our military is monitoring the situation in case of additional launches and maintaining a readiness posture."

No other details were immediately available, including the projectiles' type and flight range.

It is the 12th time that North Korea has carried out such a weapons test so far this year, with the last test-firing taking place on Oct. 2, when it tested a new type of submarine-launched ballistic missile, the Pukguksong-3, from waters off its east coast.

During the previous 10 rounds of tests, the North test-fired short-range projectiles, including its version of Russia's Iskander ballistic missile and a "super-large" multiple rocket launcher system.