The Office of Financial Sanctions Implementation (OFSI) has reported on two new reporting measures that came into force in December 2023 under the Russia (Sanctions) (EU Exit) (Amendment) (No 4) Regulations 2023, SI 2023/1364. The measures were introduced to strengthen transparency of frozen assets in the UK and assist HM Treasury to monitor compliance with, and detecting evasion of, financial sanctions. The 'immobilised assets reporting measure' requires firms to inform OFSI of any funds or economic resources they hold for the Central Bank of Russia, Russian Ministry of Finance or Russian National Wealth Fund. The 'designated persons asset reporting measure' requires designated persons to proactively provide details of their UK assets to OFSI.