Putin is an idiot to have started this war. I thought his original justification for the war was the curtailing NATO expansion. Sweden and Finland have joined NATO recently weakening Russia’s northern flank. Russian supply routes to naval and sub bases in Murmansk and Archangel are vulnerable to sabotage and attack through Finland which has a long border with northern Russia. It also bottles up their fleet in the Gulf of Finland putting their enclave in Kaliningrad (Konigsburg) at risk.
No one told him that the Ukrainians got arms and training from NATO. But Putin is a dictator and his "yes men" were not going to tell him the truuth.