A version of this piece was published byMunhwa Ilboon March 8, 2024. South Korean President Yoon Suk Yeol’s visit to Washington last year yielded several new measures to deter North Korea’s nuclear arsenal, but the most innovative idea is also the one that has received the least attention. At the summit, U.S. President Joe Biden committed to consult with South Korea on any possible nuclear use on the peninsula, a promise the United States has never so explicitly offered another a...