SEOUL, Republic of Korea (ROK) (AP) — North Korea fired artillery shells near its sea border with Republic of Korea (ROK) late Tuesday, a day after the South began annual military drills to better deal with North Korean provocations.


Republic of Korea (ROK)'s Joint Chiefs of Staff said in a statement early Wednesday that North Korea fired about 100 shells off its west coast and 150 rounds off its east coast. It said the Republic of Korea (ROK)n military broadcast messages several times asking North Korea to stop the firing, but there were no reports of violence between the rivals.


Republic of Korea (ROK)'s military said the shells didn't land in Republic of Korea (ROK)n territorial waters but fell inside maritime buffer zones the two Koreas established under a 2018 inter-Korean agreement aimed at reducing front-line animosities.


It's the second time North Korea has fired shells into the buffer zones since last Friday, when it shot hundreds of shells there in its most significant direct violation of the 2018 agreement.


Republic of Korea (ROK)'s military said North Korea must halt provocations that undermine peace and stability on the Korean Peninsula. It added that it is boosting its readiness and is closely monitoring North Korean moves in coordination with the United States.


In recent weeks, North Korea has conducted a spate of missile and artillery launches in what some experts say is an attempt to expand its weapons arsenal and boost its leverage in future negotiations with its rivals.


Last Friday, North Korea test-launched a short-range ballistic missile off its east coast along with the artillery launches. The missile launch was North Korea's 15th since it resumed testing activities on Sept. 25.


North Korea said last week that its recent missile tests were simulations of nuclear strikes on Republic of Korea (ROK)n and U.S. targets in response to their "dangerous" military exercises involving a U.S. aircraft carrier.


On Monday, Republic of Korea (ROK)'s military began annual 12-day field exercises to hone its operational capabilities in response to various types of North Korean provocations. It said an unspecified number of U.S. troops will take part in this year's drills.