There is a saying that you should learn the enemy language to understand them. I suppose the time has come again. Why else would you learn it otherwise? It is not like many of us can even visit the place without consequences. The books were translated years ago anyway.
Slavic languages are similar, IMO you just need to bombard your brain with a lot of it to start discerning the patterns (just like any other language I guess). Reading is not necessary, writing likewise. I never had a single lesson but speak fluently in russian and ok polish, can understand ukrainian, can read also.
Given that you need content for your brain it would be hard to find something nice created in russia recently, might be easier to start with polish if you are in the west.
Slavic languages are similar, IMO you just need to bombard your brain with a lot of it to start discerning the patterns (just like any other language I guess). Reading is not necessary, writing likewise. I never had a single lesson but speak fluently in russian and ok polish, can understand ukrainian, can read also.
Given that you need content for your brain it would be hard to find something nice created in russia recently, might be easier to start with polish if you are in the west.