Observations as an amateur history buff:
1. The sanctions applied to Russia right now are eerily similar to the restrictions placed on Japan pre-WW2 by the USA. They are often cited as the main reason Japan decided to attack us. Since The US would not sell them the oil, and they were not allowed by The US, to seek their own sources of oil by the same decree. They had no choice but to try to secure their own oil, while America was stunned by the Pearl Harbor attack, and also attacking: Philippines, Guam, Midway Island, Wake Island, Malaya, and Hong Kong.
2. The poor performance by the Russians will incite other Russian provinces looking for independence to possibly rebel.
3. If you do not want WW3, you must give Putin a respectful Out. Demanding his unconditional withdrawal without massaging his grievances will not lead to peace, and may lead to worse things than we have now.