Pope Francis led the world's Catholic bishops on Friday in praying for peace between Russia and Ukraine, saying the world had forgotten the tragedies of the 20th century and was still menaced by nuclear war.
Francis presided at a service in St. Peter's Basilica in which he entrusted the protection of all humanity, "especially Russia and Ukraine," to Mary, who Christians believe is the Mother of God and who can intercede with him in heaven.
