Aurel Braun is a professor of political science and international relations at the University of Toronto and an associate at Harvard University’s Davis Center. Appearances aside, they have much in common. Russia’s elderly Vladimir Putin and North Korea’s youthful Kim Jong Un have both shown an unwavering willingness to sacrifice the interests of their own people for their personal power, and are masterful international blackmailers and ruthless killers. Now, they desperately need each other. Cooperation between them, however, could incur a very high international cost, so they faced difficult dilemmas as they met at Russia’s Vostochny Cosmodrome on Wednesday. Russia,...