As Russian threats to Ukraine continue and persist, and as the Biden administration contemplates American responses, nuclear weapons lurk in the background. The nuclear option is postured to deter aggression, even in Europe, a fact made clear by a large-scale “Global Lightning” military exercise last year, which was based upon a possible Russian invasion of the Baltic states, a scenario that ultimately escalated to the use of nuclear weapons. This year—this week—Global Lightning… – Newsweek Photo: Lewis Carlyle/Space Command