Factbox-Trump threatens to isolate Iran. Who are its trading partners?

DUBAI, Aug 20 (Reuters) - A threat by U.S. President Donald Trump to impose unprecedented economic warfare and isolation on Iran could have implications for countries that trade with it. Trump warned of economic consequences for any country that supports Iran. Here are some of Iran's main trading partners in recent years: CHINA China, the biggest buyer of Iranian oil, could face additional pressures from the U.S. over its purchases if Trump follows through on his promise.