Indian Oil Corp (IOC.NS), opens new tab has bought 7 million barrels of crude from the United States, Canada and the Middle East, four trade sources said on Monday, as U.S. President Donald Trump ramped up his criticism of the country over its purchases of Russian oil. India is the biggest buyer of seaborne crude from Russia, which is under Western-led sanctions over its war in Ukraine. Its main refiners paused buying Russian oil last week as discounts to other suppliers narrowed after Trump threatened hefty tariffs on imports from countries that make any such purchases, Reuters reported last week....