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https://www.fas.org/sgp/crs/mideast/RS20871.pdf
Description
"International sanctions on Iran’s key energy and financial sectors harmed Iran’s economy and arguably contributed to Iran’s acceptance of restrictions on expanding its nuclear program in exchange for modest sanctions relief...This report analyzes U.S. and international sanctions against Iran and, in so doing, provides examples, based on a wide range of open source reporting, of companies and countries that conduct business with Iran."