https://www.reuters.com/article/us-iran-sanctions-tankers-insight/iran-hunts-for-more-ships-to-keep-its-oil-flowing-idUSKBN1QU0KM

Iran is running short of options to replace its aging fleet of tankers and keep oil exports flowing because renewed U.S. sanctions are making potential sellers and flag registries wary of doing business with Tehran, Western and Iranian sources said. Since U.S. President Donald Trump reimposed sanctions in November, exploratory talks with South Korea for up to 10 new supertankers have stalled and Panama has also removed at least 21 Iranian tankers from its registry forcing Tehran to put the vessels under its own flag, the sources said.