North Korea is making progress on an intercontinental ballistic missile capable of delivering a first-generation nuclear warhead to the continental United States, a leading US think-tank said on Tuesday. The closely followed 38 North website of the Johns Hopkins University’s US-Korea Institute argued that ICBM mock-ups seen at recent military parades in Pyongyang were ‘less fake’ than originally believed. Numerous experts had widely ridiculed the models of the North’s road-mobile KN-08 ICBM seen in 2012 and July, with at least one respected aerospace engineer labelling them technically preposterous.