VATICAN CITY (AP) — His appeals for an Orthodox Easter truce in Ukraine went unheeded. His planned meeting with the head of the Russian Orthodox Church was canceled. A proposed visit to Moscow? Nyet. Even his attempt to showcase Russian-Ukrainian friendship fell flat.

Pope Francis hasn't made much of a diplomatic mark in Russia's war in Ukraine, seemingly unable to capitalize on his moral authority, soft power or direct line to Moscow to nudge an end to the bloodshed or at least a cease-fire.

Rather, Francis has found himself in the unusual position of having to explain his refusal to call out...