Putin's invasion was not about NATO. He knows NATO will not invade Russia. A loose, defensive alliance. Nukes.
Putin invaded Ukraine in 2014, because it broke free from Russian control. Ukraine was weak, Europe was hostage and Obama was predictable. He invaded again in 2022, timed for Biden's mid-terms, knowing Trump would be a disrupter.
Putin cannot tolerate losing control of the best thing Russia had and the greatest potential impediment to restoring its past glory. Putin wants Ukraine's resources, its agriculture, its position and its people. More importantly, he wants Ukraine to not be what it could be; an independent, thriving and democratic sibling, which has freed itself from the mafia family, existing as an ever improving example to the Russian people of how good things could be under different leadership.
Trump is copying Putin's methods, but on steroids. America is becoming a patrimonial state, devoid of checks, balances, debate and open thinking. It will soon be a hungry and meaner version of Hungary. The world will be so much worse off when the light on the hill fizzles out. Has it already?