This op-ed originally appeared in The Hill. One of the biggest challenges for NATO at its July 8-9 summit will be to adopt measures that reassure allies in the face of Russian intimidation without provoking an escalation in already high tensions between Russia and the West. Given that missile defense has been a driver of tensions between Moscow and Washington since Ronald Reagan launched his Star Wars plan to render ballistic missiles “impotent and obsolete,” one of the best ways to achieve reassurance and avoid provocation would be to alter the existing timetable for deploying more capable...