The BBC's Tom Burridge reports from Shyrokyne, close to the key port city of Mariupol in eastern Ukraine, where he hears a "constant barrage" of mortars from pro-Russian troops on Ukrainian army positions, despite the ceasefire agreement.

A truce between Ukrainian forces and pro-Russian rebels in east Ukraine was brokered by the West in Minsk in February.

Ukraine accuses Russia of arming the rebels and sending Russian troops over the border - a claim Moscow denies.

Camera: Stuart Antrobus. Producer: Will Vernon.