This op-ed originally appeared in The Hill , Oct. 25, 2018. It appears that President Donald Trump ’s hard-line security advisor, John Bolton, has persuaded him to renounce the Intermediate-range Nuclear Forces (INF) Treaty signed by Presidents Ronald Reagan and Mikhail Gorbachev in 1987. At least in this case, unlike with Trump’s quixotic violation of the seven-party Iran nuclear deal, the administration can point to a treaty violation by the other party . But as a practical matter, unilateral U.S. withdrawal from the treaty is reckless and will have a similarly counterproductive and...