This Q&A considers whether you can terminate your retainer with an existing client, on the basis that they are Russian. It takes account of general common law, professional obligations under the SRA Standards and Regulations and relevant crime prevention regulatory regimes. However, it is not intended to provide comprehensive analysis of case law in relation to termination of contracts more generally—see Q&A: What are the legal issues for contracts impacted by war and sanctions following the Russian invasion of Ukraine?, which considers issues such as force majeure, frustration and illegality. For guidance on entering into a new retainer with a Russian client, see Q&A: Can I take on a non-sanctioned client from a country subject to financial sanctions, eg Russia—law firms? As a matter of common law, a solicitor-client retainer is an entire contract and, in the absence of agreement to the contrary, you cannot terminate the retainer unless you have reasonable ground for refusing to act further for the client. You will therefore need to consider: • whether