The battle for Ukraine’s skies has enormous stakes. Subscribe and turn on notifications ???? so you don't miss any videos: http://goo.gl/0bsAjO The Russian air force is huge. Ukraine’s is not. And yet, more than two weeks into Russia’s war in Ukraine, one of the biggest surprises was that Russia had not yet achieved control of the skies over Ukraine, or what’s called “air superiority.” When a military has air superiority, its planes can attack the enemy much more easily and its ground troops can advance much faster. If, or when, Russia achieves air superiority, it will have gained a major advantage in the war. To prevent or slow down that outcome, Ukraine’s allies in the west are working to deny Russia air superiority, mostly by sending weapons that can be used to shoot down planes. But Ukraine itself has asked for a more drastic step: the declaration of a no-fly...