score:3
Country of device (=Region code) doesn't matter. Samsung Pay itself will work with non-Russian VISA/MC cards but terminals will refuse such transactions. Yes, I tested this.
There is one exception: fully offline payments like public transit - they attempt to charge card later, fail to do so and sometimes ban card until this is clarified (this also happens with Russian-bank issued Mir cards if they don't have funds,etc).
Upvote:3
From personal experience, Apple Pay and foreign Mastercard/VISA credit cards don't work in Russia currently.
The same is probably true for Samsung Pay. You'd either need a Russian bank card/account or cash.
(Curiously enough, Moscow metro turnstiles recognize Apple Pay payments as valid, but seem to not charge anything.)