 He said that the U.S. had "concluded an unenforceable and untransparent agreement", allowing North Korea to keep plutonium rods in a reactor.In an article he wrote for the November/December 2007 issue of "Foreign Affairs", he referred to North Korea as a "totalitarian regime," and said that it was necessary for North Korea be committed to "verifiable denuclearization" and "full accounting of all its nuclear materials and facilities" before any "lasting diplomatic agreement can be reached.