Bangladesh, Feb. 6 -- The European Unions recent informal meeting on defense and transatlantic relations, convened by European Council President Antonio Costa, underscores the growing unease in European capitals about the future of the transatlantic alliance. The very framing of the meeting-questioning Europes security dependence on the United States-reflects a persistent anxiety that has only deepened since Donald Trumps return to the presidency. Yet, amid this political turbulence, European leaders risk losing sight of the most pressing danger: the threat from the East.

European leaders apprehensions about Trumps foreign policy should not distract them from the reality of their security situation. While NATO Secretary-General Mark Rutt...