 U.S. CSIS. Russia suffered roughly 200,000 to 250,000 total casualties in Ukraine war. Russia suffered more combat deaths in Ukraine in the first year of the war than in all of its wars since World War II combined. The U.S. Centre for Strategic and International Studies CSIS said. Overall, Russia has suffered roughly 200,000 to 250,000 total casualties, personnel wounded, killed and missing during the first year of the war. These casualty estimates also include regular Russian soldiers, militia fighters and private contractors from the Wagner Group. The number of Russian soldiers killed in Ukraine in the first year was roughly two to five times greater than the number of Russian soldiers killed in Chechnya over nearly a decade and a half. CSIS said. New research from CSIS tallies the number of Russians killed or missing in Ukraine since last February at between 60,000 and 70,000, an estimate consistent with recent British and U.S. intelligence. Thus, every month, about 5,000 to 5,800 Russian military personnel were killed. CSIS estimates that, including wounded, Russia has suffered as many as 250,000 casualties in the last year of fighting. According to the think tank, military innovation is one factor that likely explains how Ukraine has overcome its disadvantages. Though it is clearly not the only factor, the Ukrainian will to fight, political and military leadership, including that of President Zelensky, strategy and force employment, have all likely mattered, as has military economic and diplomatic support from the West. One factor that has likely contributed to Ukraine's performance is military innovation, exemplified by Ukraine's utilisation of unmanned aircraft systems in combined arms operations.