I had to learn both Russian and Engsh ?cos my mother tongue is none of them. While I find Russian harder as regards to morphology for all the endings I have to remember, and for the perfective-non perfective verbal forms and uses, ... for example, listening and understanding what I heard is more difficult in English.Well, I read, write, and speak in both Russian and English-My mother is totally rusian, and my dad is totally english, but I think that even though english is a totally screwed up and whacked language, it is a tiny bit easier that the russian language. Both are my native tounge, 50%-50% each. Split. Even check out my name. Partly Russian. Hows that for a comparison?
But of course, English is easier to me as there are more common words between Spanish and English than between Spanish and Russian. Maybe we should ask a Vietnamese what is more difficult (not a Vietcong guy educated in Moscow, of course, nor a traitor US friend).