Ukraine's overnight drone strikes have forced a temporary suspension of flights in all airports serving Moscow and the country's second-largest city St. Petersburg, but caused no damage, Russian officials reported on Tuesday.

One of the hardest-hit areas was the city of Kharkiv in northeastern Ukraine, where 17 attack drones struck two residential districts, Mayor Ihor Terekhov said. Emergency crews, municipal workers and volunteers worked through the night to extinguish fires, rescue residents from burning homes, and restore gas, electricity and water services.