Days before Russian troops entered Ukraine in late February, President Vladimir Putin gave an impassioned address to the Russian people attempting to justify what he was about to carry out. He referred to Ukraine as 'an inalienable part' of Russia's 'spiritual space'. It's one of many references to faith and religion interwoven into the Russian narrative of the 'special military operation' in Ukraine.

Ernie Rea explores the beliefs being used to justify this aggression, and asks why the head of the Russian Orthodox Church, Patriarch Kirill, has defended Putin's actions.

He's joined by Andrew Louth, theologian and Archpriest in the Russian Orthodox Church here in the UK, Geraldine Fagan, an expert in religious affairs in the former Soviet states, and Katherine Kelaidis, a writer and historian whose work focuses on early Medieval Christian history and contemporary orthodox identity.

Plus he speaks to the journalist and theologian Sergei Chapnin, who worked for the Russian Orthodox Church for 15 years.

Producer: Rebecca Maxted