After many years of trying, not very successfully, to teach myself Russian, I've decided that there will never be a better time than now to really give it my all. It's now or never!
Like you with Spanish, I am making a lot of use of Duolingo for this, CathTheWise, but there are a lot of errors in the Russian version of it, so I am spending a lot of time cross-checking things with my other resources too.
Good luck with your Spanish. I'm rather afraid that both my Spanish and my French will suffer through my concentrating on Russian, but that gives me an excuse to keep watching more French and Spanish TV than normal too 