The president who campaigned on extricating America from “forever wars” cannot have missed the warning from the new head of Britain’s army yesterday that British troops must prepare for battle in Europe as the war in Ukraine drags on. General Sir Patrick Sanders, who took the reins as chief of the general staff last week, said Russia’s invasion of Ukraine “underlines our core purpose to protect the U.K. by being ready to fight and win wars on land,” adding: “There is now a burning imperative to forge an Army capable of fighting alongside our allies and defeating Russia in battle.”