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The U.S. Department of Agriculture and the Office of the U.S. Trade Representative have been in negotiations with the Russian Veterinary Service since December 2009 when Russia notified USDA of its intent to restrict pork shipments from 13 U.S. pork plants, which accounted for more than 90 percent of U.S. pork exports to Russia. These negotiations led to the development of a new veterinary certificate to ensure that pork exports from the United States meet specific Russian microbiological and tetracycline-group antibiotic residue requirements.
http://www.fas.usda.gov/scriptsw/PressRelease/pressrel_dout.asp?PrNum=0034-10
