The Ukrainian armed forces have deployed a new kind of drone to defend their country, one filled with a pyrotechnic thermite mixture that rains fire down on enemy positions. Its use is highly controversial.

A “massive” Ukrainian drone attack sparked a giant blast in a Russian town suspected of housing an arsenal for missiles, ammunition and explosive, according to reports. The air strike on Toropets in the western part of Russia ’s Tver region also forced the partial evacuation of residents, regional authorities said on Wednesday.