Europe Needs to Come Together. This Man Has Some Ideas.

Mr. Jäger is a contributing Opinion writer and a lecturer in politics at Oxford University. He wrote from Brussels.

About a mile from the NATO headquarters in Brussels lies the cemetery of Evere. There, next to a British monument commemorating the Battle of Waterloo, visitors may stumble upon the grave of Aleksandr Kozhevnikov, known more widely by his Francophone alias Alexandre Kojève.

Originally of Russian descent, Kojève is one of the 20th century’s titanic thinkers. In the 1930s, his lectures on Hegel influenced an entire generation of Parisian intellectuals; in the 1990s, decades after his death, his ideas provided the guiding motif for Francis Fukuyama’s notion of the end of history. His significance spanned wider still. Kojève spent his final........

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