I doubt if they'll eat it. We usually say to not feed tortoises the alfalfa because it's too high in protein and hard on their kidneys. But I really doubt you'll be able to get a Russian tortoise to eat any kind of hay.
I feed my Testudo species, which includes Russian tortoises, fresh alfalfa and alfalfa hay as part of a varied, quality diet. I have seen my Russians eat fresh alfalfa, especially the flowers. I don't recall ever seeing them eat alfalfa hay and only very occasionally will they eat timothy hay. Generally speaking Most Testudo species aren't grass or hay eaters. Some individuals of some species seem to be occasionally. The exception that I have found is Marginated tortoises which seem to eat grasses and hay regularly, at least in comparison to their other Testudo cousins.