Casualties suffered by Russian forces invading Ukraine have reached catastrophic levels, and the Kremlin’s campaign to defeat Ukraine by taking Ukrainian land by conquest has ground to a bloody halt, a major bipartisan US think tank said in a review published on Wednesday.Ukraine’s long-range strike campaign has caused significant damage to Russia’s energy and fuel infrastructure, and social unrest among Russian citizens upset with the war and falling living standards is visible and growing, the report “Russian Blood and Treasure: The Ballooning Costs of Putin’s War” published by the Washington D.C.-based Center for Strategic and International Studies (CSIS) said.JOIN US ON TELEGRAMFollow our coverage of the war on the @Kyivpost_official.Attrition rate – Ukraine vs RussiaRussia has probably suffered 1.4 million total battlefield casualties, including dead, wounded, and missing soldiers, since invading Ukraine a second time in February 2022. Of those, between 400,000 and 450,000 were deaths on the battlefield, the CSIS said.The CSIS figures tallied almost exactly with the estimates of Russian casualties from sources of Ukraine’s Armed Forces (AFU) as of Thursday.In September 2022, the last public acknowledgment by the Kremlin of war casualties admitted 5,937 soldiers killed. As of mid-June 2026, independent researchers with the BBC Russian Service and Mediazona – using data from obituaries, funeral notices, court documents, and other open-source media – had confirmed 223,000-228,000 Russian soldiers killed in Ukraine – by name.