WASHINGTON — Has Vladimir Putin lost touch with reality? Once widely viewed as a cunning, if ruthless, but ultimately rational actor, the Russian president is now isolated and increasingly paranoid, having launched a war in Ukraine that has alarmed even some of his closest advisers, says Catherine Belton, a former Moscow-based correspondent for the Financial Times, now with Reuters and the author of the widely praised book “Putin’s People: How the KGB Took Back Russia and Then Took on the West.”

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