US state department is filled with Paperclipped Eastern European, and Russian Jews who grandparents were fucked over by the Soviet Union/Tsars and they want Russia broken up.
US and west thinks Russia is too big (both population and resources) and needs to be broken up (Clinton outright told Putin this).
NATO moved into a core historic Russian territory (Ukraine)
Ukrainians went full retard with Baltic Nationalist Nazi LARPing after a US led coup.
Ukrainians went even more retarded allowing CIA espionage bases along Russia's border.
Ukrainians went turbo retarded destroying Russian historical cultural sites and WW2 memorials.
Russians went full retard with Chauvinism and Putin promised to basically restore Eastern Ukraine into Russia proper as a restoration of the core Russian imperial lands.
Russia went full retard by not realizing their entire military modernization fell off the back of the truck onto VK airsoft stores, and their military training was literally all for marching and nothing else, and their Intelligence was just retards making shit up the upper levels wanted to hear so they could collect a paycheck.
Western population went retarded because it became socially acceptable to become Ukrainian ultra-nationalists, which they used to push nationalist/xenophobic furor because they view being a nationalist/xenophobe for their own country as "far-right".