There are tons of money transfer systems. You can even transfer cash from Russia to the US but I won’t tell you how not to give the ideas to block it to blackheads in the treasury who might read it.
—”There are tons of money transfer systems.”
You may want to advise your Russian friends because SWIFT was shut off last year.
Mir is crap and SPFS about the same.
That said, unless you are a heavy, no real currency is sent out of the country.