This is yet another attempt by the North Koreans to try and bait the ROK into canceling the Inter-Korean military agreement. They are going to continue these provocations until they get the reaction they want to justify conducting their long awaited nuclear test:

South and North Korea exchanged warning shots, Monday, accusing each other of border violations in the West Sea, in what is already a period of heightened tension.
According to the South Korean Joint Chiefs of Staff (JCS), a North Korean merchant ship invaded the Northern Limit Line (NLL) at 3:42 a.m. and the South Korean Navy responded with 20 warning messages and as many warning shots to repel the vessel.
However, nearly one hour after the North Korean ship retreated, the North’s military fired 10 artillery shells into the West Sea, claiming that a South Korean naval ship intruded into North Korean waters ― 2.5 kilometers to five kilometers ― with the excuse that South Korean authorities were cracking down on an unidentified ship when they made the alleged intrusion. (…..)According to the South Korean JCS, it detected the North’s launch of 10 artillery shells, which started at around 5:14 a.m., in violation of the inter-Korean military agreement, signed in September 2018 to reduce border tensions. The JCS called it a provocation harming peace and stability not only on the peninsula but also in the international community.
Korea Times
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