First comes the warning, that disembodied voice over the tannoy: "Your attention please. Air siren in the city. Please move to the shelter on the minus second floor." Then comes the mosquito-like whine of the incoming Russian drones, massing in their hundreds just above the clouds. It's followed immediately by the rattle of anti-aircraft fire, the distant thud of explosions, then finally the ominous klaxon call of ambulance and fire sirens. This is the grim reality of night time in Kyiv and