A bird is smaller than a missile and has a weaker radar response than a stealth fighter. Being able to track a bird in flight over the sea, while yourself flying far above and much faster than it, clearly communicates you'll also be capable of tracking enemy missiles and drones from distance. For technology in active military service it is impressive.
It's also not about "shaking in their shoes", but about making the other powers aware. This is the soft war that's been happening ever since first two human groups met each other - showing off your sticks and stones to deter others from trying to attack you in the first place.
It's also not about "shaking in their shoes", but about making the other powers aware. This is the soft war that's been happening ever since first two human groups met each other - showing off your sticks and stones to deter others from trying to attack you in the first place.