You should know, RussianConservative, that doctors trained in Russia have to re-study in order to qualify as doctors in the U.S. or Israel. That's just a fact. That doesn't mean that Russian doctors aren't perhaps better than doctors from countries in other areas.
My father went to med school in Poland. When he moved to Israel, he had to retake one year and redo his residence.(He was then drafted and served as a naval surgeon.) When he emmigrated to America, he had to redo his residence here.
How much is that because of skill or how much because to allow otherwise would flood markets with doctors, causing competition, lower incomes for doctors and such?