“Any war has to have guns and ideas,” said Cyril Hovorun, professor of ecclesiology, international relations and ecumenism at University College Stockholm. “In this war the Kremlin has provided the guns, and I believe the church is providing the ideas.”

In the process, Kirill has caused deep schisms in the global Orthodox Church, with priests in Ukraine, elsewhere in Europe and the United States condemning his support. Even dozens of lower-ranking clergy in Russia have broken with the 75-year-old patriarch, adding their signatures to an open letter decrying the invasion.

Orthodox priests in Ukraine have gone much further. In an open appeal last week, more than 320 of them accused the patriarch of preaching “heresy” and asked global church leaders to bring him before a tribunal to decide whether he should be deposed.

“Kirill committed moral crimes by blessing the war against Ukraine and fully supporting the aggressive actions of Russian troops on the Ukrainian territory,” they wrote. “It is impossible for us to remain in any form of canonical submission to the Patriarch of Moscow.”