Here is an interesting passage from H. Henry Meeter's classic The Basic Ideas of Calvinism (6th ed.):
[F]rom the Calvinistic point of view there can be no objection as a matter of principle to clothing such a world court with limited powers. The federal government of the United States has received a measure of federal power delegated to it by the member states which form the Union. This idea of a federal government clothed with mandatory powers has always been considered to be in perfect harmony with the views of Calvinism, as long as the rights of the states of the Union received adequate protection. Thus also a federal government of a United States of the world, it would seem, would be in full accord with Calvinistic principles and ideals, as long as the rights of the member states would receive adequate guarantee and protection (p. 151).
Might this contain the seeds of a neocalvinist theory of international relations, something only implicit but not worked out in the writings of Kuyper and Dooyeweerd?