224).Mearsheimer's arguments about Liddell Hart generated varied responses. For example, the founder of the Israel Defense Forces Operational Theory Research Institute, Simon Naveh, concurred in a separate study, which found that "by distorting the actual historical circumstances of the Blitzkrieg formation [Liddell Hart] obscured its temporal and cognitive origins.... The early-1950s display of the transformed version of Blitzkrieg as a historical fact, carrying the joint signature of Liddell Hart and Guderian, lent it an authentic touch and a professional legitimacy that could not be shaken." In contrast, Richard Swain of the U.S. Army Command and General Staff College argued that while "there is a good deal about which Mearsheimer is correct," he likely overstates the extent to which Liddell Hart's historical distortions were consciously self-serving: "To charge Liddell Hart with cleverly creating a deception requires one first to accept that Liddell Hart knew he had been wrong. There is little or no evidence of that." Nuclear proliferation and deterrence In 1990, Mearsheimer published an essay in which he predicted that Europe would revert to a multipolar environment, similar to that of the first half of the 20th century, if American and Soviet forces left after the end of the Cold War. In another article that year in The Atlantic, he predicted that the multipolar environment would increase nuclear proliferation in Europe, especially in Germany. In that essay and in the 1993 Foreign Affairs article "The case for a Ukrainian nuclear deterrent", he argues that to reduce the dangers of war, the U.S. should accept the possibility of Germany and Ukraine developing a nuclear arsenal and work to prevent the rise of excessive nationalism. Mearsheimer presents several possible scenarios for a Europe after the departure of American and Russian forces. He states that a Europe with nuclear proliferation was most likely to remain at peace because without a nuclear deterrent, Germany would be likely to once more try to conquer the continent. Mearsheimer argues it to be strategically unwise for Ukraine to surrender its nuclear arsenal (remnants of the Soviet stockpile). However, in 1994 a series of agreements required Ukraine to agree to get rid of its entire former Soviet nuclear stockpile, a process that was complete by 1996. When challenged on the former assertion at a lecture given to the International Politics department at the University of Wales in Aberystwyth, he maintained that in spite of European integration and expansion,