North Korean Leader Kim Jong-Un threatened to "wipe out" a South Korean island as tensions has risen to its highest level after Washington staged joint drill with Seoul.

North Korean Leader Kim Jong-Un threatened to "wipe out" a South Korean island as tensions has risen to its highest level after Washington staged joint drill with Seoul.

In a visit Monday to border artillery units, Kim briefed artillery officers "to strike and wipe out the enemies" on Baengnyeong and turn the island into a "sea of fire", Korean Central News Agency (KCNA) reported on Tuesday.

"Once an order is issued, you should break the waists of the crazy enemies, totally cut their windpipes and thus clearly show them what a real war is like," Kim said.

Following the North Korean leader's threats, the South put all village councils in the island on high alert.

"It's not like there's a mass exodus of panicked islanders to the mainland. But to be honest with you, we're a bit scared," said Kim Young-Gu, an administrative official on Baengnyeong.

Kim went on to say that artillery units, stationed near disputed waters, should fire warning shells on enemy warships sailing close to the maritime border recognized by Pyongyang and then destroy them in case they cross it.

The comments came on the same day that South Korea and the US launched a week-long military drill that has prompted Pyongyang to abandon the 60-year-old Korean War armistice, along with non-aggression pacts signed with the South.

North Korea condemned the maneuvers as a launch pad for a 'nuclear war,' saying it is scrapping the 1953 Armistice Agreement that ended the Korean War.

North Korea also had cut off the Red Cross hotline, which was installed in 1971, on five occasions in the past, most recently in 2010.