Source: National Catholic Reporter by Christopher White This article appears in the War in Ukraine feature series. View the full series. ROME — For four weeks, the Vatican has offered to serve as a mediator between Russia and Ukraine, and for four weeks, such overtures have been ignored by Russia. As Russia’s war against Ukraine rages on, Pope Francis has incrementally escalated his rhetoric against the invasion, condemning it as an “unacceptable armed aggression,” while refusing to directly name President Vladimir Putin or Russia as the aggressors. The diplomatic tightrope has been defended as consistent with longstanding Vatican neutrality, necessary for protecting Catholics in both Ukraine and Russia and…