As a native Russian I know Russian perfect - it's my weapon. But inspite of I know English not to bad, i would never write any long article say about Nabokov or about Almodovar films. for now of course.
I can share a lot of information which I learned for while my life, but I don't have enough blocks-words just to write-write-write without breaks for checking a word in a dictionary or rewriting all sentence because of wrong words order.
For writing really well you need to think on the language
True. Your message is easy to understand for me as the russian guy. But it might be confusing for other readers :)