Washington, April 25 -- Iran is continuing to load millions of barrels of oil onto supertankers, an activity that will only become increasingly difficult if the US keeps up a blockade on Tehran's shipping. Images from the European Union's Sentinel 1 satellite, captured on Monday, show one very large crude carrier that's capable of hauling about 2 million barrels of oil, moored at the jetty on Kharg Island. An earlier image from Saturday showed no ships moored at Kharg. With no evidence of large volumes of oil circumventing the US blockade, the loaded crude is likely filling up tankers Iran has available in the region. Monday's image shows 13 ships, most of them VLCCs, anchored to the east of the island. An image from the day before the blockade started on April 13 shows about half that number. The US said its maritime barrier in the Sea of Oman has stopped almost three dozen Iranian vessels from passing, keeping crude from the Islamic Republic reaching customers. As President Donald Trump's administration tries to slash oil revenue that's crucial for Iran, market watchers are looking for evidence on how long Tehran can maintain production. Iran has been the only major oil exporter out of the Persian Gulf since the war in the Middle East started in late February...