The "invasion" of the territories that Russia already occupied since 2014 didn't surprise me. I expected them to do something like that and then just stop there, but just before going to sleep last night I was shocked to see that they were apparently doing a full invasion, and I stayed up until 2 watching the situation unfold...

The information is spotty. Is it possible that Russia "only" did some airstrikes, but now they're going to stop? I heard a rumor that Putin gave Zelenskyy an ultimatum to cede eastern Ukraine within 12 hours or else Putin would continue with a full invasion, but I don't know if this comes from a reliable source.

It'd definitely be possible for Ukraine to fight off Russia with a years-long insurgency. The West will be giving them endless supplies, so Russia would have a much harder time than the US had against Afghanistan, for example. But I don't know if the Ukrainians have the will to fight Russia for years, and I don't know that I'd even recommend that they do so, since the costs of this sort of insurgency would be so high.

This situation is so, so tragic. Ukrainians deserve to be free, but many are going to suffer and die for no reason, and the country will probably fall under an authoritarian regime. Russians will suffer a lot, as well: I see no world in which this action does anything but massively hurt the average Russian. Relations between Russia and the West will get even worse. Nothing against the people of these countries, but how does it make any sense that the US has better relations with Vietnam, Japan, and Saudi Arabia than Russia? Russia is part of Europe, their culture descended from Ancient Greece and Rome...