Gen Oleksandr Syrskyi made the comments in an interview with the BBC, his first since he was forced from his post in the summer after a public disagreement with the defence minister.
Syrskyi rejected critics who described him as too "old school" to command Ukraine's technologically advanced forces. He also pushed back against allegations from soldiers who served under him, who told the BBC they had been ordered to remain at their positions even when almost surrounded by Russian forces, leading to high losses.
He claimed Moscow's overall losses in the war are six times higher than Ukraine's. "If you count only dead, then it's up to 11 times," he said. Neither Russia nor Ukraine officially releases casualty figures. Ukraine's military says it inflicted record losses on Russian soldiers in September, a claim that cannot be independently verified.
The BBC cited UK intelligence estimates that Russia has lost around half a million men killed since launching its full-scale invasion in 2022. The US-based Center for Strategic and International Studies estimates Ukraine has lost up to 150,000 troops killed by June 2026. Those figures point to a considerably narrower ratio than the one Syrskyi described, although the estimates cover different periods and definitions.
Syrskyi attributed the battlefield situation to the difference in death tolls, Ukraine's technological advances, and a strategy of attacking weak points in Russia's lines while containing its advances elsewhere.