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 Korea–Russia relations
In May 2014 Russia and North Korea have agreed to settlements in rubles in all trade between the two countries. The first transactions in rubles between Russia and North Korea were carried out in October 2014.