Would it be worth Wikimedia UK's while to put out a blog post talking about quality control processes (ad-hoc as they are) on Wikipedia? Not so much as a direct reply - both because these articles look like they're just filling empty column inches, and because we obviously can't prove a negative (that "Russian trolls" *aren't* running amok on political articles). Rather as a timely reminder of what Wikipedia is about and how the 'wisdom of the crowd' makes it quite difficult to grossly distort its content. I could say something about what admins do, though there I'm sure there are people who spend more time on politicians' biographies than I do.