A new think tank report claimed that the total casualties in the Russia-Ukraine war have risen to over 2 million, including up to 600,000 deaths, but the confirmed total remains elusive.

The report from the Center for Strategic and International Studies, released on Wednesday, gave the think tank’s latest input on the grinding war that has now lasted longer than World War I. The study authors claimed that Russian casualties have reached 1.4 million, including between 400,000 and 450,000 deaths, and that Ukraine suffered between 525,000 and 625,000 casualties, including between 125,000 and 150,000 deaths.