The United States and other major agriculture exporters said Wednesday theywere disappointed that the European Union wanted to change its rules forimporting cereals. "The timing couldn't be worse. We believe this is thewrong message, the wrong direction, at the wrong time," said Allen Johnson,who heads the US delegation to the World Trade Organization negotiating onopening up international trade in agriculture.EU officials argue that the current system, which is based on US commodityprices, no longer reflects the world market and has led to imports of hugequantities of wheat, especially from Russia and Ukraine. They want tointroduce a system that would fix import tariffs based on a series ofquotas, with duties rising as the volume increases, the Russia Journalreported. .