Whether the right of nations is the same as the natural right?

Objections

Objection 1 : It would seem that the right of nations is the same as the natural right. For all men do not agree save in that which is natural to them. Now all men agree in the right of nations; since the jurist [*Ulpian: Digest. i, 1; De Just. et Jure i] "the right of nations is that which is in use among all nations." Therefore the right of nations is the natural right.
Objection 2 : Further, slavery among men is natural, for some are naturally slaves according to the Philosopher (Polit. i, 2). Now "slavery belongs to the right of nations," as Isidore states (Etym. v, 4). Therefore the right of nations is a natural right.
Objection 3 : Further, right as stated above (Article [2]) is divided into natural and positive. Now the right of nations is not a positive right, since all nations never agreed to decree anything by common agreement. Therefore the right of nations is a natural right.