"Russia started the war with around 3,000 operational tanks ... so there is a good chance that Russia has lost one half of (its) usable tanks," said Jakub Janovsky, a military analyst who contributes to the Oryx blog...Last February, prior to Russia's full-scale invasion of Ukraine, Janovsky estimated that Moscow had a reserve supply of approximately 4,000 military-grade tanks. However, many of the tanks "were not properly stored and might be hard to reactivate quickly," he added.