Ukraine has lost 8,300 soldiers and foreign mercenaries killed or wounded over the past week, with Russia's Battle Group Center taking the heaviest casualties, military expert Andriy Muchko said. "The enemy has lost approximately 8,310 Ukrainian militants and mercenaries killed or wounded over the past week. Ukrainian armed formations suffered their heaviest loss of personnel in the area of responsibility of the Battle Group Center, which operates in the Donetsk People's Republic and the Dnipropetrovsk region," he wrote in VK after analyzing the data of the Russian Ministry of Defense.