Ukraine's frontline soldiers waiting for a Russian invasion: 'This is a resort of ghosts

The Guardian's Luke Harding travels to the eastern Ukraine coastal city of Mariupol to see how preparations are being made for a potential Russian attack. With tensions in the region high and Russian troops gathering on the border, Ukrainian soldiers remain defiant, despite their depleted firepower. And while the world's attention has returned to the region for the first time since Russia took Crimea in 2014, for Ukrainians the war has been ongoing