NATO’s top military officer has said Russia’s armed forces are incapable of any major advance. “The Russians don’t have the numbers necessary to do a strategic breakthrough,” NATO’s Supreme Allied Commander Europe Christopher Cavoli told reporters on Thursday. “More to the point, they don’t have the skill and the capability to do it; to operate at the scale necessary to exploit any breakthrough to strategic advantage,” the US General said. His comments come as Ukrainian forces engage in fierce battles with Russia’s troops for control of Vovchansk, a key town in Ukraine’s northeastern Kharkiv r…