Anastasiya Gribanova BBC Ukrainian Service, Kyiv Scarlett Barter BBC World Service Kevin McGregor / BBC Ukrainian serviceman Serhiy Melnyk holds the piece of shrapnel that was once lodged in his heart From his pocket, Serhiy Melnyk pulls out a small rusty shard, wrapped neatly in paper. He holds it up. “It grazed my kidney, pierced...