S. Korean politician calls for home-grown nuclear 'deterrent' The most prominent South Korean advocate for returning US nuclear warheads to the peninsula Tuesday called for Seoul to withdraw from the Nuclear non-proliferation treaty and develop home-grown weapons as a deterrent to the North. Chung, a former presidential candidate and seven-term lawmaker, told AFPTV today's crisis was "1,000 times as serious" as the Cuban Missile Crisis. Images and soundbites.