Libya wasn't a sovereign state. There's no such thing as a legitimate sovereign dictatorship, the notion of national sovereignty doesn't exist in the context of slavery: the people in question were not sovereign.
Any free foreign nations had a moral right to invade the US south before the US Civil War and attempt to free the slaves. Any free foreign nations had a moral right (not a moral requirement) to invade Libya in an attempt to free its people from Gaddafi's dictatorship.
Ukraine was a sovereign state and a burgeoning liberal democracy, which is why Russia had to try to destroy it.
Any free foreign nations had a moral right to invade the US south before the US Civil War and attempt to free the slaves. Any free foreign nations had a moral right (not a moral requirement) to invade Libya in an attempt to free its people from Gaddafi's dictatorship.
Ukraine was a sovereign state and a burgeoning liberal democracy, which is why Russia had to try to destroy it.