An American official has told The New York Times that last night’s powerful nuclear test in North Korea could be linked to Iran’s pursuit of nuclear weapons, and that “it’s very possible that the North Koreans are testing for two countries.” Tehran and Pyongyang have long cooperated on missile technology, with Iranian engineers even reportedly in attendance at a 2012 North Korean missile launch. Iran’s coordination with other rogue regimes is bound to heighten suspicions that it is not negotiating over its atomic program in good faith, and that what assurances it can provide about domestic checks will be circumvented via overseas cooperation.