Two days after an unprecedented drone incursion by Russia on Polish territory on September 10, NATO unveiled its response -- Operation Eastern Sentry. The mission kicked off immediately on September 12 but will be fleshed out further in the coming weeks. The whole idea, according to the military alliance, is to strengthen its posture, connectivity, and flexibility along its entire eastern flank. While the focus right now is on Russia's drones and geographically on Poland, it is multidomain -- meaning land, sea, and air forces are involved -- and…