Uk, a typical western country, stills seems to be work out her ways to slap RUSSIA with bans following the poisoning of an agent from UK. While RUSSIA keeps denying the poisoning attack amidst other claims by the UK, it has come under the scrutiny of many western countries while forming a close tie with China. Do you think the UK can really slap Russia with bans without any consequence?
Russia is very powerful and I don't think that a country like the UK can harm it with their sanctions.
The only way that the UK can harm Russia is through their allies. If all of them pose sanctions to Russia then they indeed will have serious problems.