Russia struck cities across Ukraine on Monday with a missile barrage that killed 31 people and heavily damaged a Kyiv children’s hospital in an assault condemned as a ruthless attack on civilians. Dozens of volunteers, doctors and rescue workers were digging through debris of a part of Okhmatdyt paediatric hospital in a desperate search for survivors after the rare day-time bombardment, AFP journalists on the scene saw. The first responders ran for cover when sirens and a explosion sounded after the initial strikes – a repeat attack that left four dead at a maternity hospital in a separate dis…