But that difference in reach makes all the difference.
Attacking an enemy with a nuke is existentially different from past attacks.
No past overthrow of a feudal regime faced such a problem:
the regime can defend itself from internal threats by launching nukes, or threatening to.
Attacking you with a gun is different in reach but no different in character. Adding a blower to a Camaro increases the power and speed but does not change the character of the driver.
“the regime can defend itself from internal threats by launching nukes”
Will they nuke their own cities, like a rebellious Hong Kong? No.
Would mobs raging against a domestic economic crisis believe, or even care about, Government rhetoric about foreign war? Not if economic conditions get bad enough.
Would the regime survive a nuclear exchange? Doubtful.