Arrogance and a false sense of absolute security ultimately face the test of Divine justice. The illusion that a nation can fortify itself in completely unreachable places shatters when confronted by God. Extreme altitude and total isolation offer no shelter from Him, and impending ruin will always find its mark, even in strongholds where human hands cannot reach.
To illustrate this, the prophecy relies on imagery from the natural world. It compares the nation to an eagle, a creature that flies higher than all other birds to build its home in the most elevated peaks. The act of soaring high represents the nation elevating its own dwelling place [אבן עזרא, רד״ק], while the nest serves as a metaphor for this lofty, seemingly untouchable habitation [מצודת ציון].
The primary approach among commentators treats this scenario as a theoretical attempt at escape. Even if Edom were to hide and elevate its home as high as the stars, far beyond the reach of any other people, God declares that He will bring them crashing back down to earth and deliver them into the hands of their enemies. In this reading, the idea of placing a nest among the stars is conditional, acting as a warning of what would happen if they even tried [רד״ק, מצודת דוד, ביאור שטיינזלץ, צאינה וראינה].
In contrast, another perspective reads this not as a theoretical condition, but as a direct command from God to rise to the stars. The reasoning behind this surprising directive is that a fall from a low altitude simply does not cause enough damage. Therefore, God intentionally elevates Edom to the highest possible point to maximize the severity of their destruction. It is much like lifting an enemy high into the air solely to drop them and ensure a fatal blow. This points to a future time when the kingdom of Edom will reach the absolute peak of its size and power. From that ultimate summit, God will cast them down into the Valley of Jehoshaphat [מלבי״ם].