The fascist dictatorship in their government is the biggest problem, of course, but I'm looking to see if any potential scenarios explain their actions in a way other than "they just crazy".
In terms of game theory, growing up when the Soviet Union was a power, one term I heard a lot on the TV news was "tit-for-tat". They do something bad, we respond. They want to exchange spies, we exchange spies. And so on. Then we had the end of history, peace dividend, and so on. Then with Putler and Putpoleon complex, the language being used were things like "multipolar world" and "red lines".
Way I see it, the Multipolar world is used by the west to describe a world where capitalism is so globally integrated that no one country can control anything. The emerging BRIC countries were such large markets that they could develop their own weather systems, and Europe has to depend even less on relationships with the USA. Like a natural extension of how Europe was no longer on life support from the USA after rebuilding from WW2, and the US became less centrally important as a manufacturing country. But for Russia and China what a multipolar world means is that they no longer have to pretend to listen when lectured to about Democracy, World Peace, or Human Rights. They can build a new world order where concepts like that belong to "the empire of lies".
Red lining and avoiding any conflict are strategies you use to manage your relationship with a narcissist (like Pooty Booty). It is very different to a strategy like "tit-for-tat" which is not effective against someone who will only use dark psychological warfare moves and never de-escalate. If you avoid any conflict with them, then they have fewer chances to "act out" their dark patterns and find ways to be abusive to you. If you set out red lines, then it is clearer that they are the ones being abusive to you, and it is harder for them to make the argument that you are in offence against them or are persecuting them.