19.The U.K.'s latest estimate are in line with figures from Ukraine's General Staff, which, as of Dec. 19, sits at 768,220 troops lost since the start of the war. The figures do not specify killed or wounded, though the overall consensus is that it includes dead, wounded, missing, and captured."It is highly likely that they have sustained significant combat casualties, whilst only achieving limited tactical gains," Pollard told British parliamentarians on Dec. 19. Russia has gained ground in eastern Ukraine and Kursk Oblast in recent months but at the cost of heavy casualties.Russian losses reached record highs in November and December, with a daily high of 2,030 troops lost in November, marking the highest daily loss since the beginning of Russia's full-scale invasion in 2022.