Do you mean this link :
http://www.metaldetectingworld.com/detecting_in_russia.shtml
Notice it's "1913" or older. Any any subsequent talk of "no detecting", or "no picking up coins" [even eyeballing] etc.... can all be understood in the context of that 1913 age limit.
Ok, so what? So if you're detecting, you're not finding coins older than 1913, ARE YOU ? I mean, sheesk, same for here in the USA: do any of us go waltzing over to bored rangers waving old coins, asking someone to come to the math with a calculator? I have utterly no doubt, that if I walked in to my local city or county hall, with an 1880 $20 gold piece, and said "can I keep this?" that someone would also tell me "no". Ok, so what? Who goes around parading their stuff for people to see the ages of stuff, to begin with ?
And I wonder if these things even apply to private land. Ie.: farmers lands with permission, versus public lands, to which (duh) public land use laws apply. Yes I know it says the "entire country", but that can be taken to mean "all public land" in the "entire country".
For example: the same can be said of Britain. Where no one waltzes into public parks and hunts for old coins. Why? Because they belong to the queen or whatever, since they're on public land. But what a farmer does in his own potato field, is his own business, outside the laws governing public land use. So too might this be the case there, where such things are to be interpretted as applying to public land, not your own flower garden, etc....