President Donald Trump's looming sanctions on Iran are the biggest in a series of mysteries confronting the oil market right now. Even though sanctions on Iran's energy sector go into effect on November 5, questions continue to linger about just how many Iranian barrels will get knocked offline. South Korea, Japan, Greece and France have already slashed their oil purchases from Iran. But will India get leeway from the Trump administration to keep buying? Will China comply with Trump's sanctions in the middle of a trade war with the United States? And then there's Saudi Arabia, the world's largest oil exporter. No one ... (full story)