The Bank of Russia filed a lawsuit in Moscow seeking 18.2 trillion rubles ($229 billion) from Euroclear, the state-run Tass news service reported Monday.

Most people outside of banking won't have heard of Euroclear. It's a Brussels-based settlement provider that enables the transfer of ownership of securities between seller and buyer. The firm is the focal point of a major geopolitical confrontation between Russia and the European Union.