Don't you mean "WAS"? Isn't that EXACTLY what happened in 2022??In the case of Estonia they don't allow any Russian into their country (with some exceptions). Whether you agree with that measure or not they are consistent.
In the case of the UK if they ban tennis players but let in some oligarchs/businessmen...that would be ridiculous.
You are talking like this is a hypothetical scenario. No. THIS HAPPENED ALREADY!!!
The oligarchs and business man were kept inside the country, trading, and doing business worth billions of UK pounds. The UK economy was prospering compared to other country who stopped business with Russia and made huge economic losses, effecting the well-being and standard of living of millions of people unrelated to the war. Yet the UK benefits still from their business relations to Russia.
BUT they have banned Diana Shnaider from playing Junior Wimbledons. THEY have banned Kudermetova, Potapova, Sabalenka, Azarenka, Kasatkina, Medvedev, etc. from competing in Wimbledon. Surely this has more effect than the billions of UK pounds worth of economic value the business man are doing in the UK, untouched...