Ukraine war: six months that shook the world

FILE PHOTO: Service members of the Ukrainian armed forces, who surrendered at the besieged Azovstal steel mill in Mariupol in the course of Ukraine-Russia conflict, sit in a bus upon their arrival under escort of the pro-Russian military in the settlement of Olenivka in the Donetsk region, Ukraine May 20, 2022. REUTERS/Alexander Ermochenko/File Photo

(Reuters) - Six months ago this week, Vladimir Putin ordered tens of thousands of Russian troops into Ukraine on a "special military operation" - a mass invasion on a scale unseen in Europe since World War Two.

Since then, tens of thousands of people have been killed, millions have fled and cities have been reduced to rubble by Russia's relentless bombardment.