Yes, we need to move away from fossil fuels but the reality is that we are still dependent on them so we may as well look at strategic independence and economic gains and produce what we can ourselves.
So, your long game should be to forge amicable relations with your next-door neighbour, rather betting everything in your relationship with your manipulative friend on the other side of the pond. In the meantime, you should also become self-dependent.
Russia would love to regain the European land the Soviet Union lost.
And Putin is not an idiot to attempt expansion to lands with no ethnic-russian population. Such thing is clearly not feasible without the power structures of the former USSR.
People like to think that if they would have assassinated Hitler early on, WW2 wouldn't have happened, but that's wrong. That would have just left the power vacuum empty for someone else to capitalize on the German populations' grievances and start the war.
The history lesson is to make sure the masses of people are taken care of by their leaders, not to start censoring, imprisoning or assassinating political opponents who capitalize on the peoples' unhappiness.