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Russian word друг comes from Proto-Indo-European *dʰrewgʰ-, and later Proto-Balto-Slavic *draugas (Friend.)
*dʰrewgʰ- (Proto-Indo-European)
*dʰrowgʰos (Proto-Indo-European)
*draugas (Proto-Balto-Slavic)
Friend.
*drugъ (Proto-Slavic)
Friend, companion Other. Second.
друг (Russian)
Close friend.