I had a discussion about that a few days ago with friends. It's not necessarily "for your country" or "patriotism" it can just be fighting for what you stand for.
Sadly what a lot of people stand for these days is living their little comfortable life, as long as war doesn't knock on their door they're fine, but then when it does happen it's too late
While I mostly agree with that sentiment, please go look at Russian history. The past 20 years were probably the longest stretch of time when the Russian society was able to live a relatively decent life (by ex-USSR standards, however terrible it is by Western ones) for the past few centuries.
That's (I think) is why almost nobody was willing to 'rock the boat', as the Kremlin Führer says. Now everything is going down the toilet and most of the society haven't yet realized whet they're up for.
It's easy to criticize others when the worst thing your country has seen is the civil war 300 years ago. Russia went through 3 arguably even more serious events in the past century only. Nobody wanted to risk the little peaceful life they had, and still everything went down the drain.
You should first and foremost be willing to risk your life for your family, loved ones, as well as your children, for which you probably want a good/better future.
Starve is out of the table after Stalin used it as an atrocious instrument for mass genocide of Ucranian (and Russian) people in 1933. They remember and will not commit the same error of being passive with the new Stalin 2.0. As ugly as it sounds, "starve" there means cannibalism.
Also, I looked at it more closely and found that Russia has become food self-sufficient in the past decade. This was likely the key fact that emboldened this invasion. The needs of the people will be met even in the event of full insulation. In fact, accelerating insulation may make taking full autocratic control easier. Few would be willing to die for a revolution if their base needs are met. This seems like a bad time to live in Russia.
Ukrainians were able to overthrow their government, and so can you.