The rescue operation is what matters most, and we must always keep that in mind.
The rescue can now be initiated.
Reconnaissance has been conducted many times, and the troop deployment of the Airin Formation is completely under surveillance. The flight route has also been deliberated and revised several times, and as for the GPS signal location, that, of course, is always being monitored.
The helicopters need to bypass ground troops with anti-air capabilities and must also avoid anti-air missile positions that protect Addis Ababa.
Ethiopia's army is decent, and its air force, well, so-so; definitely much stronger than countries without an air force, but their anti-air capability is almost nil.
Ethiopia really doesn't have any aerial threat, so naturally, there's no real need for anti-air defense. At most, there's regional air defense accompanying ground forces. As for nationwide radar coverage that can detect aircraft invading airspace at any time, that's simply impossible.