The U.S. government expressed its irritation with Russia over the country’s new requirement that U.S. beef and pork shipments be tested and certified free of the feed additive ractopamine. "The United States is very concerned that Russia has taken these actions, which appear to be inconsistent with its obligations as a member of the World Trade Organization,” said U.S. Trade Representative Ron Kirk and Agriculture Secretary Tom Vilsack, in a joint statement. “The Unite...