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About Russian Ruble
The ruble or rouble is the official currency of Russia. Banknotes and coins are issued by the Central Bank of Russia, which is Russia's monetary authority independent of all other government bodies.
The ruble is the second-oldest currency in continuous use, after pound sterling, as well as the first decimal currency. The ruble was the currency of the Russian Empire and later the Soviet Union, where it was known as the Soviet ruble. Following the dissolution of the Soviet Union in 1991, the Soviet ruble was replaced in Russia with the Russian ruble at par in the following year. The Russian ruble continued to be used in 11 post-Soviet states, forming a "ruble zone" until 1993. In 1998, the ruble was redenominated shortly before the 1998 financial crisis, at a rate of 1000 RUR = 1 RUB.
The ruble is a free-floating currency and is subdivided into 100 kopecks which have fallen out of use due to inflation. In 2023, the digital ruble was introduced. The Russian ruble is also used as a de facto legal tender in Baikonur, Abkhazia and South Ossetia. WikipediaAbout Vietnamese dong
The dong is the currency of Vietnam, in use since 3 May 1978. It is issued by the State Bank of Vietnam. The dong was also the currency of the predecessor states of North Vietnam and South Vietnam, having replaced the previously used French Indochinese piastre.
Formerly, it was subdivided into 10 hao, which were further subdivided into 10 xu, neither of which are now used due to inflation. The Vietnamese dong has recently switched to exclusively using banknotes and moving towards digital payments, with lower denominations printed on paper and denominations over 10,000 dong, worth about 40¢ dollar or euro, printed on polymer. As of 2022, no coins are used. The 500,000-dong note is the highest-denomination banknote in circulation in Vietnam. The note is dark blue in color and has been in circulation since 2003.
As of 9 December 2025, the Vietnamese dong is the third-lowest valued currency unit, with one United States dollar equaling 26,373 dong. Wikipedia