While I agree, that in the best of all worlds, we would achieve both goals, if the cost of meeting goal # 1 is to fail goal # 2, it’s a choice that has to be made. And I think that the leaders of the US and NATO both see that -substantial- material aid being given to the Ukraine would fall under the heading of direct support - which would encourage Russia to step up it’s nuclear sabre rattling.
I think that’s the issue with the Polish jets - it would be (probably correctly) seen as a direct involvement in the war by Russia, far more than the more limited man-portable weapons. Do I think it would lead to a straight-up nuclear exchange? No, but I wouldn’t be surprised to see a ‘demonstration’ made, possibly up to and including a tactical level nuclear device somewhere in Ukraine. A “look at what you made us do” moment from Russia, with heavy mentions of what happens the next time such an intervention takes place.
So, back to the what else should we do? I’d say, put more pressure on China and other powers that haven’t agreed to non-military sanctions yet. I understand that the US doesn’t want to further compromise relations with China, but now might be a time to suggest ‘unofficially’ that the US is considering a resolution, in light of China’s lack of concern about break-away territories, that we might move towards a formal recognition of Taiwan.
YES, that would be dangerous as well, don’t get me wrong, which is why it’s a unofficial suggestion. The standard realpolitik playing out, in that if you want to preserve the current status quo, then they need to help preserve it as well.
A second point, and yes, another one that makes me feel dirty, is to fast-track the Iran Nuclear treaty - I’m sure Iran would be happy to be able to sell oil at the current prices, and it’ll relieve NATO/US costs for oil, while simultaneously limiting Russia’s non-military threat and ability to fund itself.
Will any of this ‘save’ the Ukraine? No, but ideally, if Russia wins, but is economically crippled, the Ukraine (or most of it) can be recovered at the diplomatic table. To keep Russia from going nuclear, I strongly suspect that the break-away territories will be lost, and any new Ukraine state will be de-militarized as well as being bound by treaty to stay out of the EU and NATO. But that may be the best compromise we can hope for - Putin gets to say he won, and the Ukraine gets to continue to exist in part.