A rare armored vehicle has made a surprise appearance in the Ukrainian order of battle. A recent official photo depicts a three-person, 49-ton T-64BM alongside tankers from the Ukrainian army's 57th Motorized Brigade. The brigade holds the line in northern Ukraine around 30 km northwest of Kharkiv.

What's unusual is that the 57th Motorized Brigade was known to operate the lighter T-64BV tank, the standard tank in Ukrainian service. Moreover, the Ukrainian army doesn't have many T-64BMs. There were around 80 in the Ukrainian inventory on the eve of the wider Russian invasion in February 2022, and at the time all but a handful belonged to the 1st Tank Brigade and the 12th Independent Tank Battalion.

Both units had a single T-64BM battalion with around 31 tanks.

In 54 months of hard fighting, the 12th Independent Tank Battalion and 1st Tank Brigade—the latter now reorganized into the less tank-heavy 1st Heavy Mechanized Brigade—has lost around a quarter of their T-64BMs. Even if the units cannibalized a few T-64BMs from training grounds, today they'd both struggle to field a full battalion of T-64BMs.

Given the thin supply, where did the 57th Motorized Brigade's T-64BMs come from? It's a question that vexes French historian Stevius. And it may point to a growing shortage of the best tanks in the Ukrainian armed forces as losses deepen and years of combat take their toll on vehicles' material condition. "The use of a few specimens from training units to fill the gaps ... would tend to show that the Ukrainians have practically exhausted their stock of tanks that they can bring back to operational condition," Stevius noted.

Overall, the Ukrainians have lost no fewer than 1,400 tanks, according to a tally by the Oryx open-source intelligence collective. That's more tanks the the Ukrainian armed forces had in their inventory in 2022. The Ukrainians have largely made good their losses by restoring old stored T-64s and T-72s while also accepting donations of hundreds of surplus tanks from foreign allies.

But even with the restored and donated tanks, there's still a shortfall. It's fortunate, then, that tanks are growing less important by the day as tiny drones—which are lethal to tanks—fill the sky over the 1,200-km disputed gray zone in Ukraine.

Up-armored T-64

The $2.5-million T-64BM is a better-protected variant of the standard T-64, which the tank factory in Kharkiv produced first for Soviet forces and, later, for Ukrainian forces. To produce a T-64BM, the Kharkiv Tank Plant swapped in the 125-mm main gun from the newer T-80 tank, tweaked the fire controls and added slabs of Nozh modular armor on the front of the hull, the turret face and the roof.

The problem was, and still is, that the add-on armor weighs three tons. "The weight of the Nozh armor modules unbalances the tank toward the front and strains the shock absorbers," Stevius explained. Even replacing the T-64's 700-hp diesel engine with a more powerful 850-hp model didn't fully compensate for the added weight. That "results in the T-64BM Bulat suffering from underpowering, regularly causing engine overheating," Stevius pointed out.

Still, the type fought hard in the initial Russian invasion of eastern Ukraine starting in 2014. And eight years later, T-64BMs with the 1st Tank Brigade successfully defended the city of Chernihiv from invading Russian forces. "The faster autoloader on the T-64 allowed Ukrainian tank crews to achieve significant damage against surprised Russian units," Mykhaylo Zabrodskyi, Jack Watling, Oleksandr Danylyuk and Nick Reynolds wrote in a 2022 report for the Royal United Services Institute in London.

As the war ground on and drones replaced heavy vehicles as the main means of attack and defense for both sides, the T-64BMs lost some relevance. Yes, both sides still deploy tanks—but mostly as mobile artillery firing at targets located by drones many kilometers away.

The lighter usage of tanks belies the shortage of functional tanks owing to combat losses and wear and tear, however, especially on the Ukrainian side. A sweeping reorganization of Ukrainian force structure last year eliminated many tank battalions, but the tank shortage persisted even after the unit reduction.

Stevius is stumped. "The presence of a T-64BM Bulat in the 57th Motorized Brigade, which until now has only used T-64BV, is therefore a surprise because their number is insufficient to equip both two or even one tank battalion of the 1st [Heavy Mechanized Brigade] and the ranks of the 12th Independent Tank Battalion," Stevius mused.

The likeliest explanation is the most worrying. The Ukrainians stripped tanks away from training units while also compelling front-line battalions to go into battle with fewer tanks. All in order to make sure all the tank units have at least a few tanks.

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