Archbob
Ancient CFC Guardian
That's a bit unfair. I think you're right in an IR context, but the language used is sometimes very similar. E.g. the Atlantic Charter:
"Third, they respect the right of all peoples to choose the form of government under which they will live; and they wish to see sovereign rights and self government restored to those who have been forcibly deprived of them;"
Sovereign rights appear to belong to peoples, not states.
There's also a long tradition of talking about 'popular sovereignty' in constitutional theory.
So I can understand the OP's confusion.
It actually belongs to both because the State is always embodied by either the ruler, the ruling political group, or the people. The state and its ruling class are inseparable.