Russia losing free trade with Ukraine is pretty much nothing compared to the economic damage caused by the sanctions, and loss in gas sales to the EU.
Putin's action would have been rational if he had captured Kyiv in a couple of days or weeks, and managed to install a puppet government. IMO the whole thing was based on bad intel, lies, corruption and yes-men who told their superiors what they want to hear, rather than what was the truth about Ukraine's defense capabilities. After that Putin couldn't back off without losing his face, and obviously loss of human lives and economic damage mean nothing compared to that to him.
Putin's action would have been rational if he had captured Kyiv in a couple of days or weeks, and managed to install a puppet government. IMO the whole thing was based on bad intel, lies, corruption and yes-men who told their superiors what they want to hear, rather than what was the truth about Ukraine's defense capabilities. After that Putin couldn't back off without losing his face, and obviously loss of human lives and economic damage mean nothing compared to that to him.