Pope calls Ukraine war an 'abuse of power'

"The tragedy of the war taking place in the heart of Europe has left us stunned," he said, adding that few people would have imagined scenes similar to the two world wars in the 20th century.

His latest condemnation came in a message to a Catholic Church conference in Bratislava, the capital of Slovakia, one of the countries bordering Ukraine that has opened its doors to refugees.

"Once more humanity is threatened by a perverse abuse of power and partisan interests which condemns defenceless people to suffer every form of brutal violence," he said.

Moscow says its action is a "special military operation" designed not to occupy territory but to demilitarise and "de-Nazify" its neighbour.

The Pope has rejected that term, however, saying previously it could not be considered "just a military operation" but a war that had unleashed "rivers of blood and tears".