Russian враг

← Old Church Slavonic врагъ (borrowed)

← Russian во́рог (doublet)

← Proto-Slavic *vorgъ (derived)

→ Czech vrah (cognate)

→ Komi-Permyak вӧрӧг (borrowed)

→ Russian друг (link)

→ Russian ворог (doublet)

→ Russian вражеский (affix)