To take ground quickly, with any element of surprise, they would likely avoid urban areas where they would be more vulnerable to attack. Russia showed early on in this war, in its failed attempt to surround Kyiv, that a long column of armour on a road is an easy target.Mr Barry, of ISS, says any spearhead attack would look for an enemy's weak points. But he also warns that Russia has spent the last few months reinforcing defensive positions with trenches and tank traps.Western tanks are also about 20 tonnes heavier than their Russian counterparts. The additional armour gives better protection but it also means the tanks may be too heavy to cross some makeshift bridges. Russia and Ukraine have both blown bridges to slow down advances.
