A rescue effort was underway, Prime Minister Rumen Radev said, after one of the two ships sank. It was not immediately clear where the drones originated.

© Petko Momchilov/Reuters

MQ-9 Reaper drones — known for high-profile deadly strikes — have been shifted from Africa to Colombia and Ecuador, U.S. officials said.

© Heather Ainsworth for The New York Times

Evacuation is almost impossible and food is running out in Russian-occupied Oleshky, a city menaced by mines and drones.

© Sergei Supinsky/Agence France-Presse — Getty Images

The bridges, used by many commuters in the Ukrainian capital, are the latest target in a broad Russian bombing campaign against infrastructure.

© Valentyn Ogirenko/Reuters