Any trade deal between China and the U.S. should comply with multilateral rules, and not doing so may create economic risks for the Asian nation\u2019s other major trading partners should China import less from them, the International Monetary Fund said. China committing to more American imports \u201ccould be a negative impact on third countries whose exports to China would be crowded out,\u201d IMF Asia-Pacific Director Changyong Rhee said Friday at a briefing in Washington. \u201cThe agreement should be consistent with multilateralism, rather than bilateral,\u201d he said. \u201cIf the deal involved preferential access for the U.S. to Chinese markets, this could lead to broader worries about the future of the multilateral trading system.\u201d The two biggest economies are still ironing out details of an agreement, which would likely include China making major purchases of American agricultural, energy, and other products to reduce the trade gap with the U.S. Potential purchase commitments already worry major trading partners such as Australia amid signs that its coal was being delayed at Chinese ports as relations recently soured. IMF Asia-Pacific Deputy Director Jonathan Ostry said the fund\u2019s research shows that if China agrees to buy an additional $50 billion in goods from the U.S., the spillover effect of the possible diversion on Australia will be relatively small. \u201cBut if the deal involves more purchases of goods in commodities that are very high in the China-Australia trading relationship, then the impact on Australian growth could be more substantial,\u201d Ostry said. Rhee also warned of risks from a failure of Washington and Beijing to forge an agreement, especially in global financial markets that have already factored in reports of progress.