Is there any proof that it was Russia? Anything, even a shred of evidence? I see only a weasel expression "believed to" - not explaining by who and why.
These dirty trick they always play when they see that fair play will not given them any advantage in their economical and political goals. All the yardsticks they use be superior are b.s now I think, like democracy, freedom of press/speech, human rights etc. Instead they are least democratic and free states run by conglomerate of capitalist like selling their rights with soap and diapers.