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In addition to Sovietology, he became an expert on the twilight stage of the roughly 400-year period when Britain was part of the Roman Empire.

“What used to be known as American Sovietology in the past has also changed; it has different goals,” said Mr. Pivovar, an expert on émigré history who was a Fulbright Scholar in 1993 at the University of Michigan in Ann Arbor, one of the centers of Russian studies in the United States during the Cold War.

Old hands in Sovietology have never seen anything like it.

After the author's twin brother Zhores, a distinguished biochemist and author, was exiled in 1973, he managed to send Roy from Britain scores of important works of Western Sovietology that were unavailable in Russia.