North Korea's claim this week to have successfully conducted a third underground nuclear test is prompting some in South Korea and Japan to advocate possessing their own such weapons.

​​South Korean lawmaker Chung Mong-joon of the governing Saenuri (New Frontier) party made such a remark during a meeting of his colleagues from the National Assembly, comparing the situation with North Korea to “a gangster in the neighborhood buying a brand-new machine gun” and trying to defend oneself with merely a pebble.