A looming ramp-up in U.S. sanctions on Tehran will further spook potential buyers of Iranian oil although supplies to Europe will most likely remain uninterrupted, top trading houses told the Reuters Global Commodities Summit this week. FILE PHOTO: A security personnel looks on at oil docks at the port of Kalantari in the city of Chabahar, 300km (186 miles) east of the Strait of Hormuz, Iran January 17, 2012. REUTERS/Raheb Homavandi/File Photo U.S. President Donald Trump is likely to take a major step against the Iran nuclear deal on Friday, marking a more aggressive approach to Iranian activities in the Middle East. Trump will lay out his plan in a 12:45 p.m. EDT (1645 GMT)speech at the White House, the product of weeks of internal discussions between him and his national security team. Any big increase in sanctions will effectively leave the oil market where it […]