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Opinions like Mr. Kwon's appear to be spreading. Two opinion polls conducted after the third test, one by Gallup Korea and the other by the Asan Institute for Policy Studies, found that 64 to 66.5 percent of the respondents supported the idea that South Korea should develop its own nuclear weapons, similar to polls after the Yeonpyeong attack in 2010.
“Having a nuclear North Korea is like facing a person holding a gun with just your bare hands,” said Mr. Kwon, the engineer. South Koreans should have “our own nuclear capabilities, in case the U.S. pulls out like it did in Vietnam.”