Where does “мини́стр” come from?

мини́стр (Russian) comes from Latin minister, from Latin minus, from Proto-Italic minos.

Ancestry of “мини́стр”, step by step

Step	Language	Word	Meaning
1	Latin	minister	attendant, servant, waiter; agent, aide;...
2	Latin	minus	nominative neuter singular of minor; accusative...
3	Proto-Italic	minos	—

мини́стр — Etymology, Origin & Word History | Etymology Explorer