The kopeck or kopek is or was a coin or a currency unit of a number of countries in Eastern Europe closely associated with the economy of Russia. It is usually the smallest denomination within a currency system; 100 kopeks are worth 1 ruble or 1 hryvnia.
Originally, the kopeck was the currency unit of Imperial Russia, the Russian Soviet Federative Socialist Republic and then the Soviet Union (as the Soviet ruble). As of 2020, it is the currency unit of Russia, Belarus and Ukraine. The Russian kopeck is also used in the two breakaway states of Abkhazia and South Ossetia. Transnistria, another breakaway state has its own kopeck. In the past, several other countries influenced by Russia and the Soviet Union had currency units that were also named kopecks.