Russian President Vladimir Putin believes that it’s “still premature” to use cryptocurrencies for settling trades of energy resources such as oil. The Russian president discussed potential use cases of cryptocurrencies in a Thursday CNBC interview following a plenary session of the ​​Russian Energy Week forum. According to a full interview text published on the Kremlin’s official website, Putin said that private cryptocurrencies “can act as a unit of account,” but they are “very unstable.”