National narcissism is associated with support for populist and anti-democratic leaders and decisions in one's own country. We hypothesize here that it might also relate to more favorable judgments of outgroup populist leaders and actions, even if the latter may pose a threat to the ingroup. Using the context of the Russian attack on Ukraine, we hypothesize that people with a higher level of national narcissism would be more supportive of Russian attacks, Putin, and the Russian people. Study 1 confirmed this hypothesis on a multinational sample (N = 40 countries), showing that national narcissism is related to a more favorable attitude towards Russia and less willingness to cut economic ties with Russia. Studies 2 (N = 339 French) and 3 (N = 400 Americans) tested our hypothesis by additionally considering the moderating role of the explicit target of the attack (Ukraine vs. ingroup) and mediation through perceived belief similarity with Putin and Russians. In both studies, national narcissism was related to a judgment of the attack (on Ukraine or the ingroup) as more moral and, in France, to a more positive judgment of Putin. These effects were mediated by perceived belief similarity. In France, these effects were specific to national narcissism, while national narcissism and national identification showed similar patterns in the US. Finally, in both countries, these more favorable attitudes did not extend to the Russian people. This study highlights that national narcissists are inclined to support a populist, anti-democratic outgroup leader and his actions, although these may ultimately harm the ingroup.