Very different situations. We are now looking at a developed country that is democratizing and courting the free world that has been straight up invaded and is asking for help. This is worlds away from an I’ll advised war against an already shaky dictatorship or popping into someone else’s civil war hoping you can prevent more bloodshed.
I agree that in all honesty, we probably don’t care all that much about Ukraine per-se. But we do care about the idea of sovereignty. Very much in fact. We also care about Eastern Europe and Europe as a whole. If you don’t think this is Putin’s litmus test for Poland, Lithuania, Romania, etc, you’re being naive. And while we’re being honest, yes, this is a chance to affect Russia’s abilities to threaten its neighbors and hold Europe hostage over energy, which have been major concerns of ours for years now. To recap, our interests in the region are: the survival of a democratic nation and its people, protecting the very idea of sovereignty, hardening the NATO alliance (and finally getting Europe to pay its fair share & take defense seriously), weaning Europe off Russian energy, and sending the Russians something with a little more kick than the strongly worded letters they’ve been receiving from the UN the last several years.
And the icing on the cake is that our strategy does not involve any direct military confrontation with Russia. Sure there are pundits out there who argue we should act more aggressively, but I have not heard one voice from the current administration make that argument. The Russians say we risk nuclear escalation by supplying weapons and support to Ukraine because of course they do. What other cards do they hold? None. Their conventional forces were apparently worse off than we thought and have been severely degraded from there. They’re quickly losing their biggest bargaining chip in Europe, energy, and it’ll likely be gone permanently. They thought they were good at information warfare, and maybe they were but they’re losing this one (at least abroad). So the one card they have left is waiving around their nukes. But Putin likes living. He likes his mansions and his boats and his girls. While he’s no 4D chess player, he’s smart enough to know that all turns to glass if he actually pulls the trigger.