Chung Mong-Joon, a lawmaker and son of car manufacturer Hyundai's founder, told CNN's Anna Coren that nuclear deterrence is the only way to live with a nuclear-armed North Korea.
"Nuclear deterrence can be the only answer. We have to have nuclear capability," he said.
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A recent poll shows two-thirds of South Koreans agree that nuclear capabilities are essential to dealing with North Korea.
South Korea voluntarily forfeited their nuclear capabilities in 1991 after signing a denuclearisation agreement.

