Korean yen
The Korean yen was the currency of Korea between 1910 and 1945. It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. The yen was subdivided into 100 sen. It replaced the Korean won at par and was replaced by the South Korean won and the North Korean won at par.
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.