Ukrainian officials have run more than 8,600 facial recognition searches on dead or captured Russian soldiers in the 50 days since Moscow’s invasion began, using the scans to identify bodies and contact hundreds of their families in what may be one of the most gruesome applications of the technology to date. The country’s IT Army, a volunteer force of hackers and activists that takes its direction from the Ukrainian government, says it has used those identifications to inform the families of the deaths of 582 Russians, including by sending them photos of the abandoned corpses. The Ukrainians champion the use...