"The Russian ruble has plunged more than 20 per cent in pre-market trading following sanctions placed on the country’s financial institutions after the attack on Ukraine."
https://www.independent.co.uk/news/world/europe/russia-ukraine-ruble-sanctions-trading-b2024591.html
https://www.independent.co.uk/news/world/europe/russia-ukraine-ruble-sanctions-trading-b2024591.html