South Korea accuses Pyongyang of lying after warships exchange artillery fire

The transcript discusses a recent incident involving North Korea's alleged attack on a South Korean vessel near Yeonpyeong. North Korea denies involvement, calling it a baseless claim. South Korea has issued a stern warning and is prepared to respond decisively to further provocations. Despite North Korea's denial, their actions have heightened military tensions, and there is a call for them to cease such provocations immediately.

What was the response of North Korea after the artillery provocation mentioned in the text?

What does the speaker believe should happen to North Korea's provocative actions?