Pope Francis is warning that "a good part of humanity" will be destroyed if tensions with North Korea escalate, and he is calling for diplomacy and a revived United Nations to take the lead in negotiating a resolution.

Francis was asked as he travelled back to Rome from Egypt on Saturday about North Korean ballistic missile tests and U.S. warnings of "catastrophic" consequences if the world fails to stop them. He was asked specifically what he would tell U.S. President Donald Trump, who has sent a U.S. carrier to conduct drills near the Koreas, and other leaders to try to diffuse the tensions.

Francis says he would urge them to use diplomacy and negotiation "because it's the future of humanity."

The pope says "Today, a wider war will destroy not a small part of humanity, but a good part of humanity and culture. Everything. Everything, no? It would be terrible. I don't think humanity today could bear it."