American brands such as the Kentucky Fried Chicken and McDonalds are quite popular in Russia. So I really doubt how much successful this boycott will be in the major cities of Russia.
It opens new business opportunities for Russian companies: Stalingrad Fried Chicken

This will probably come concurrently with the imminent ban on homosexuals, though I have no idea if it's considered "manly" or "gay" in Russia to eat the fried penis of a homosexual.