Ukraine's long-range drone attack on Russian airbases marked a major embarrassment for Moscow's air force.

• Two years ago, Ukraine launched an overnight drone assault deep inside Russian territory.
• The drones overwhelmed air defenses and hit strategic bombers parked in neat rows.
• Lining up expensive planes in the open left them wide open to a cheap swarm attack.
• The strike showed how small drones can take out billion-dollar aircraft.

Outlook: Expect Russia to keep dispersing and hiding its aircraft as drone warfare reshapes how air forces protect their planes.