Greek Prime Minister Kyriakos Mitsotakis said on Friday he condemned 'in the most intense manner' a decision by Turkey to convert Istanbul's Hagia Sophia museum into a mosque.

"This is a choice which offends all those who also recognise the monument as a world heritage site. And of course it does not only affect relations between Turkey and Greece, but its relations with the European Union," Mitsotakis's office said in a written statement.