Two of the United States' biggest burger chains have become the latest targets of Kremlin wrath, with McDonald's fast-food offerings under the political microscope for alleged impurities and Wendy's driven out of Russia altogether by deteriorating collaboration with the host country.

The undeclared war on the American cheeseburger follows a two-year pattern of proxy swipes against U.S. businesses and interests in Russia, including a ban last year on American adoptions of Russian orphans and demonizing of U.S. aid organizations and pro-democracy consultancies.