Russia has quietly become Iran’s most consequential external partner. Public reporting shows Moscow feeding Tehran real time satellite imagery of U.S. and Israeli positions — a simple but powerful boost to Iranian targeting and battle damage assessment. Russia has also helped upgrade Iran’s Shahed drones with better navigation and communications systems. These aren’t glamorous contributions, but they matter: they force the United States to burn multimillion dollar interceptors on cheap, disposable threats. None of this changes the balance of power. But it absolutely changes the tempo of the war. China’s support looks different — quieter, but just as important. Beijing...