In a brutal and terrifying three days, Russia has wreaked havoc on the tiny, battered Ukrainian air force – lofting drones to surveil the air force’s front-line airfields and then firing ballistic missiles to destroy hard-to-replace warplanes. As the missile campaign continues and the toll mounts – four or five aircraft were destroyed in 72 hours – it’s increasingly clear just one thing can save what’s left of Ukrainian air power. More Western-made air defenses. But they’d better come fast. The current wave of attacks began on July 1, when a Russian drone spotted six Ukrainian air force Sukhoi Su-27...