Russian officials on Sunday claimed they struck another Ukrainian base that purportedly served as a training center for special operations forces, killing more than 100. At the same time, Ukrainian authorities alleged Russian forces bombed an art school in a besieged city. Defense Ministry spokesman Igor Konashenkov said via state-run media that “high-precision air-launched missiles” struck a base in Ovruch in the northern Zhytomyr Region, located in north-central Ukraine. Those who were killed in the airstrike were “foreign mercenaries who arrived in Ukraine” in recent days, he said, according to state-backed RIA Novosti. Konashenkov did not provide evidence for the claim that the base was being used by foreign mercenaries or Ukrainian special operations forces. Ukrainian officials have not issued public comments on Konashenkov’s statement on Sunday. Over the weekend, Moscow also said it used hypersonic missiles to destroy Ukrainian military assets. It’s the first time Russia has acknowledged using such weapons in …