South Korea is conducting naval firing drills just a day after North Korea warned such exercises would aggravate already high tensions between the rival neighbours.

South Korean Joint Chiefs of Staff officers said Monday’s drills off the Korean peninsula are not near the tense western sea border where the North shelled a front-line island last month.

Officials say the drills are to continue through Sunday. They spoke on condition of anonymity citing office rules.

North Korea rained shells on Yeonpyeong Island on Nov. 23. Pyongyang said South Korea first fired artillery toward its territorial waters. The shelling killed four South Koreans.

South Korea says it fired shells southward, not toward North Korea, as part of routine exercises.

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