All the new world order crap. The UN, the council on foreign relations, etc. He was for selling the Panama Canal. I remember watching him debate Reagan and Pat Buchanan on that.
Murray Rothbard, paleocon of fragrant memory, once accused Buckley of being totalitarian for having supported the idea of a large and powerful defense establishment (in preference, Buckley insisted, to learning Russian at gunpoint). So Buckley was d'accord with the Neocons on that policy, anticipating them by several years.
But he was also a conservative more in the colors of Burke and Hobbes, than of Thomas Jefferson. He dreamed of a civilized, Catholic world in which gentle people could all get along in their fortress of moneyed solitude, and not be roiled by the anxieties of nationalism that the French Revolution and Napoleon's wars had stirred up in Europe, dividing the upper classes of the great powers and placing them in competition, and limiting their social intercourse.
Holding the Panama Canal was a PR disaster, especially after after our actions during the Suez crisis in 1956. I don't remember Buckley being pro UN, pro new world order, etc. unless it advanced American interests.