Stockpiles of the most advanced US-made weapons are limited – while few know how large Iran’s arsenal isMiddle East crisis – live updatesThe war in the Middle East in maps, video and photosThe outcome and duration of the war in the Middle East may be decided by a grim calculus based on the size of Iran’s drone and missile stocks v vital air defence munitions held by the US, Israel and Gulf states, analysts and officials say.Since Saturday, Iran and its proxies have sought to counter the intensiv...