South Koreans want their own nukes. That could roil one of the world’s most dangerous regions

This photo distributed by the North Korean government shows what was said to be the launch of a Hwasong-14 intercontinental ballistic missile, ICBM, in July 2017 in North Korea’s northwest, . (Korean Central News Agency/Korea News Service via AP, File)

CHEORWON, South Korea — To the steady rat-tat-tat of machine guns and exploding bursts of smoke, amphibious tanks slice across a lake not far from the big green mountains that stand along the world’s most heavily armed border.