Russia and its allies have lost at least 2,001 tanks in the first 15 months of Russia’s wider war on Ukraine, according to Oryx, a collective that tallies wartime equipment losses.

That’s two-thirds of the tanks Russian and allied forces had in active service before the war. Worse for the Russians, Oryx’s count includes only those tanks the collective’s members can visually verify on social media. In other words, it’s an undercount. Observers widely assume actual losses—destroyed, damaged and captured tanks—are a fifth to a third higher.