Ben Barry, senior fellow at the International Institute for Strategic Studies (ISS), tells the BBC that Western tanks will make a difference. But the former British Army Brigadier also warns that the pledges made so far are unlikely to prove decisive.In modern warfare, tanks have been a key element for offensive operations - to punch through enemy lines and retake territory.Used effectively, they provide mobile firepower, protection, shock and surprise. Concentrated in numbers, they can dislocate an enemy's defences. But they also need the support of artillery to first weaken those defences and then the support of infantry to hold retaken ground.

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