American policies focus on military aid to Colombia and free-trade talks in which the United States refuses to include farm subsidies or anti-dumping measures.
Meanwhile, China said it would ban imports of soya oil from Argentina, seemingly in reprisal for anti-dumping measures against textile and other exports to Argentina.
Potentially competitive Russian products, such as steel, have suffered badly from anti-dumping measures notably in the United States, which argues that Russia's low domestic energy prices give it an unfair advantage.