The biggest reason that you won't see a Russian helicopter Type Certified in the US anytime soon is because ther is no Bilateral agreement betwen US and Russia that allows it. The only agreement that is in place as of today is to allow some Russian airplanes with US avionics, engines, and propellers into the US. These agreements are put together by departments of state or there equvalent agencies.
I have 1100 hrs in various Russian helicopters from the Mi-2 through the 35P and the Ka-32, and they are all good machines with some limitations, just like all helicopters. They would not be certifiable in the U.S. FAA world for standard category without a lot of waivers and changes. They are incredibly cheap to buy and for that reason would cause a lot of grief to the US OEM's who sell helicopters for big bucks. In my opinion, for the Secretaries of the U.S. Departments of State and Transportation to allow a bilateral opening the doors for Russian helicopter certification in any category except "Experimental" would cost someone their political career.airplanes