Stigma
Herald of the Judgement
Ok. So to seriously approach the topic.
It wouldn't surprise me one bit if Russia interfered in Brexit. (But a clear proof would be great). So far we have speculation.
If this is the case, however, in my opinion the main reason would be that Russia is still (albeit somewhat diminished) global superpower and it always tries to posit itself as the key player in European (and World) politics.
They simply will play every card they can if they can get something out of that or any other critical socio-political occurance.
However, the same can easily be applied to other major global players like the US or China.
I would be wary of weaving a narrative of *bad Russians cheat the unsuspected masses of other countries* given that in this game there are essentially no good guys. They have the means to do it, the same with the US, the same with China.
BTW from the standpoint of the Russians, it is Americans who meddle in everything. From the standpont of the Chinease, it is Russians and Americans that always try to run everything and so on and so forth.
I realize this forum is very Anglo-centric, but be mindful of that too.