I would not use Russian casinos. First of all, I think if I gamble on Russian casinos and lose, then at some point I indirectly support the Russia against the Ukraine because the profit that casino makes goes into Russians budget and funds their soldiers.
Look on a situation from different angle. Try not to lose, but instead make Russian gambling platform go bankrupt. With it, you will reduce amount of tax paid and reduce war funding. How do you like that ? Would you support the movement aimed to bankrupt Russian gabling platforms? Or lets hire Ocean and his friends to rob their safes?
You see, all these boycotts, sanctions, rallies, bans or leaving Russian market does not work so far. This situations between Russia and Ukraine must be settled on a different level.
Sorry but the angle you are trying to look from is non-existent. How can I try not to lose and instead make their gambling platforms go bankrupt? Casino games aren't solely based on luck. Do you completely ignore the mathematical properties of probability? the house edge? Please google the mathematics of gambling and then you'll understand that it does not matter what you try, you can't beat the house, you can't beat their games because you can't beat the math, no one has ever beaten the math cause it's just impossible. Understand, that the more you play, the more the math works against you.
You also clearly haven't readen my full post, I said that it's even risky for me to deposit in Russian casinos because they can lock my accounts and I won't be able to do anything against them, so, even if it was possible to beat their casinos, I'm facing another risk.