A Russian drone strike on Kharkiv, Ukraine's second largest city, killed at least seven people overnight, including three children, Kharkiv region governor Oleh Syniehubov reported Saturday. He said the Iranian-made Shahed drone hit civilian infrastructure in the Nemyshlyan district on the city, causing a massive fire that burned down 15 private houses. Interior Minister Ihor Klymenko said more than 50 people had been evacuated and that emergency workers had contained the blaze by Saturday morning.