The threat of a global conflict spawned by Russia's invasion of Ukraine should convince everyone that the time has come for humanity to abolish war before it abolishes humanity, Pope Francis said on Sunday.

"More than a month has passed since the invasion of Ukraine, since the start of this cruel and senseless war, which, like every war, is a defeat for everyone, for all of us," he said to thousands of people in St. Peter's Square for his Sunday blessing.

"We must repudiate war, a place of death where fathers and mothers bury their children, where men kill their brothers without even seeing them, where the powerful decide and the poor die," he said.