I now use Busuu which is much better in my opinion. It actually gives you proper explanations on the reasonings behind things they are teaching you rather than just throwing shit at you with no explanation like Duolingo does. I feel I learnt more in the first month of using it than I did in a year and a half of Duolingo.

I do need something else to supplement my learning to go with it however but that is more due to my inability to fully grasp different concepts and such. My brain is just more geared to maths and science so I find languages in general inherently more difficult.

The only thing with busuu is it has a smaller pool of languages so I'm not sure if Russian is one of their taught languages.