Korean currency
The yen was the currency of Korea during the Colonial rule, from 1910 to 1945, and was issued by the Bank of Joseon It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. It was replaced by the South Korean won at par in 1945, and by the North Korean won in 1947.
North Korean support for Iran during the Iran–Iraq War
North Korea sold arms primarily as a source of foreign exchange. North Korea demanded the currency of its declared enemy, the United States, as payment. Sales ended only after North Korea's nuclear test, in October 2006, caused the passage of United Nations Security Council Resolution 1718 embargo.