In the context of the new trade architecture developing in the world to bypass the US dollar, bankers and traders with whom this correspondent spoke said the most difficult aspect of taking bilateral trade out of the multilateral system of mostly dollar-denominated trade is that the rules change with each country. “Sanctions are not the problem as much as how countries are unwilling to give up their advantage,” said one trader who deals with both Iran and Russia. New Delhi has limited rupee trade with some countries but these are small and preliminary deals with countries with which India runs trade surpluses.