President Moon Jae-in says that South Korea will respond sternly to any act that threatens the lives and safety of the public.
He made the remarks during a ceremony to celebrate the country's 72nd Armed Forces Day this morning.
The president stressed the need for a strong military to ensure peace.
South Korea needs to secure a strong defense posture, which nobody can surmount, on its own to make, keep and build peace. I promise that the government and the military will respond resolutely to any act that threatens people's lives and safety.
His remarks come a day after the South Korean military confirmed that North Korea shot dead and burned a South Korean civilian who had crossed the western sea border.
There's been no official response from Pyeongyang as of yet.
President Moon made no direct mention of North Korea in his address, and focused on highlighting the future vision for the military.
On Thursday, he called the incident "shocking", adding it cannot be tolerated for any reason and called on the regime to take responsible measures.