MOSCOW—The videos were certainly not what Russians have come to expect from their country’s secret warriors abroad: powerful men in unmarked uniforms imposing Russian influence on Syria, Ukraine, and Africa. These men were caught on camera by Belarusian security officers totally unprepared. Some were naked except for underwear, with documents, propaganda leaflets, and condoms strewn around their hotel rooms. Others wore vaguely marked uniforms. All 33 of them were military-age Russians hunkered down just outside Minsk a few days before Belarus’ presidential elections.

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