Vladimir Putin's most important tank has been left with a "disco head" after the vehicle was seen spinning out of control during combat.

The T-90 was seen glitching when Ukrainian troops in American Bradley fighting vehicles attacked the Russian tank.

Footage of the problem - informally known as "disco head" - appeared to show the tank's turret spinning frantically before its soldiers fled.

During a drone attack, another video shows the T-90 turret spinning out of control once again.

A military expert has suggested the issue could be down to crew disorientation or electronic failures inside the tank.

"It’s very easy for inexperienced people to become disorientated in a tank because a tank’s hull can move in one direction, the turret could be in another direction and the commander’s sight could be in a completely other direction," former British Army tank commander Hamish de Bretton-Gordon told The Telegraph.

He added: "It could also be an electronics failure. Western tanks have a quite sophisticated fire control system, and the Russians don’t appear to have got it right."

Fighting continues in eastern Ukraine near the city of Kharkiv as Ukraine pushes back against Russian forces.

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One former Russian Lieutenant Colonel shared what he believes Putin fears most about his war in Ukraine.

Sergey Gulyaev said he thinks the main focus for Putin is to take control of the Zaporizhzhia, Donbas, and Kherson regions.

But, in order to seize control of these areas, Russia would need to tackle the 12-mile-long Kerch Bridge - which is the main supply route.

"A bridge is a very vulnerable thing in general," Gulyaev told The Express.

"It can be hit from all sides, from the water, from the air, and with long-range missiles and even with small drones."

"The supplies need to be cut off and I think that this will happen.

"This is the consequence for Putin and it will have a very strong influence and impact. This is what they fear most."