South Korean President Lee Myung-bak on Monday called for national solidarity against military hostility by the North, saying Pyongyang sees divisions in the South as an opportunity to attack, reported Reuters.
The North last week threatened to launch a nuclear "sacred war" with Lee vowing "a merciless counterattack" against any new North Korean attacks.
"We can't afford to have division of you against me in the face of national security, because what's at stake is our very lives and the survival of this nation," Reuters quoted Lee as saying in a national radio address.
"It is when we show solidarity as one that the North dares not challenge us. Their will to challenge breaks," he said.