боец
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
Russian > Greek
ζευγίτης, ἥρως, ἀσπιστής, μαχητής, μάχιμος, πολεμιστής, πτολεμιστής, ὑπέρμαχος, λοχίτης