Crypto wallets have also recently been banned in Russia due to sanctions of the European Parliament... Even if I somehow find a loophole through some countries, it’s still not an option. Someone’s gonna want to figure it out, and someone’s gonna give up and there’s gonna be more of them.
But I ask you to keep Steam Early Access page not only for that players from Russia can support your work, there will, frankly, still be few. And to keep your work going and the project going. Whoever wants to support you, will buy this DLC, who will want to play for free, will play for free. But most importantly, more people will know about the project and I think the development with the new finances and, maybe, with new peoples, will go faster. Many developers do so, even developers of modifications, example: https://store.steampowered.com/app/1508910/RealRTCW__Supporter_Pack/