To answer your questions about Ukraine:
Supply Ukraine with weapons and training on them immediately . Anti armour weapons, man packable anti aircraft missiles, personal weapons, tanks (leopards would be nice), APCs, etc etc. Yes I know significant training is needed on some but it can be expedited/sped up (I have military experience from when I was younger so I'm not naive). The concept of running a tank should be the same to any tank crew for example... it is just the specifics of each model. Worrying about Russia learning about them is silly. They likely know a whole lot about our stuff already.
Fire Germany's reactors back up so they can reduce or eliminate Russian natural gas. Heavy meaningful sanctions that will actually hurt Russians at home. You do understand qthat Russia wants Ukraine under its thumb after this don't you? What Putin wants will essentially be Russia on the Polish border. He was an agent in Germany. He dreams of owning the Baltic states, Czech, Slovakia, Hungary, Romania, Bulgaria, etc. again. And when he has them, the rest of Europe will be scratching their collective arses and saying, "Gee, how'd that happen?"
And quite frankly I'd love to see my government force natural gas pipelines to our coasts (and fast) so we can be an alternate supplier of natural gas to Europe. Fuck Putin and anyone in Russia who supports him.