There are two sides to this, the other one being that Russia also gain from the relationships that are in place at present and will be wary about risking them.

There are two sides to this, the other one being that Russia also gain from the relationships that are in place at present and will be wary about risking them. Wealthy Russians deal with the UK because it benefits them and because they (in many cases) like living here. Yes they can take their money elsewhere but that's not something that comes without an impact on them - if there was somewhere just as good or better for them they'd already be doing business there. The same applies to Germany - they are each other's largest trading partners. Sure the Germans don't want to ruin that but nor do the Russians. 30% of Germany's oil and gas comes from Russia - that's not a customer the Russian's will be eager to upset. This is why trade supposedly stops wars - we're all interdependent - and that works both ways but it does make things complex when things like this do happen.