NATO concluded a major anti-drone exercise this week, with Ukraine taking part for the first time as the Western alliance seeks to learn urgently from the rapid development and widespread use of unmanned systems in the war there.

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.