I think the agreement is reciprocal, 3 year, multiple entry for both sides.
Based on what I've read.

It would not surprise me if the US steps up their standards a little (for Russian Federation citizens), in my honest opinion more I think a lot more people world get turned down, since the visas are for 3 years, if that is the case. I would imagine higher standards would apply, or in some cases not everyone will get the 3 year visa..

I hope I pass the Russian test : I've been to the country multiple times, never overstayed, never got into trouble, dutifully registered (even back when it was 3 days, draconian as it is)