The OP states ' it has been well established that Russia influenced the result of our EU referendum using social media '. ---
It is said Russia influenced / hacked / used Trolls to influence the United States , German , French , Italian etc. Elections.
So why has nobody looked at the UK General Election in 2017? If Putin had an Ally anywhere in the west it could be thought certain UK politicians would fit the bill.
As for the Magnitsky Act at least the UK has adopted it unlike most of the other countries . Am I correct only 6 countries have formally adopted the Magnitsky Act. The EU are debating the subject.
Happy to be corrected!
As for the Magnitsky Act this might shed a bit of light to answer the OP question ( or not as the case maybe ):-
www.parliament.uk/business/publications/written-questions-answers-statements/written-question/Commons/2018-09-11/173536/
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