Russian history, including Russia under the Old Regime (1974), The Russian Revolution (1990), and Russia Under the Bolshevik Regime (1994), and was a frequent interviewee in the press on the matters of Soviet history and foreign affairs. His writings also appear in Commentary, The New York Times, and The Times Literary Supplement. At Harvard, he taught large courses on Imperial Russia as well as the Russian Revolution and guided over 80 graduate students to their PhDs. Pipes is known for arguing that the origins of the Soviet Union can be traced to the separate path taken by 15th-century Muscovy, in a Russian version of the Sonderweg thesis. In Pipes' opinion, Muscovy differed from every other State in Europe in that it had no concept of private property, and that everything was regarded as the property of the Grand Duke/Tsar. In Pipes' view, this separate path undertaken by Russia (possibly under Mongol influence) ensured that Russia would be an autocratic state with values fundamentally dissimilar from those of Western civilization. Pipes argued that this "patrimonialism" of Imperial Russia started to break down when Russian leaders attempted to modernize in the 19th century, without seeking to change the basic "patrimonial" structure of Russian society. In Pipes's opinion, this separate course undertaken by Russia over the centuries made Russia uniquely open to revolution in 1917. Pipes strongly criticized the values of the radical intelligentsia of late Imperial Russia for what he sees as their fanaticism and inability to accept reality. Pipes stressed that the Soviet Union was an expansionist, totalitarian state bent on world conquest. He is also known for the thesis that, contrary to many traditional histories of the Soviet Union at the time, the October Revolution was, rather than a popular general uprising, a coup foisted upon the majority of the Russian population by a tiny segment of the population driven by a select group of intellectuals who subsequently established a one-party dictatorship that was intolerant and repressive from the start. In what was meant to be an "off-the-record" interview, Pipes told Reuters in March 1981 that "Soviet leaders would have to choose between peacefully changing their Communist system in the direction followed by the West or going to war. There is no other alternative and it could go either wayDétente is dead." Pipes also stated in the interview that Foreign Minister Hans-Dietrich Genscher of West Germany was susceptible to pressure