If Russia takes Ukraine, then Russian forces will directly adjoin the Polish border. It makes sense to attempt to reduce the pretext for any invasion of, or ret

If Russia takes Ukraine, then Russian forces will directly adjoin the Polish border. It makes sense to attempt to reduce the pretext for any invasion of, or retribution on, Polish soil. If the Americans give the Ukrainians jets and Russia has a problem with it, they can fight it out with the Americans. They're both further-removed and a much larger adversary. Furthermore, it says more-emphatically, "Poland didn't give them those planes, NATO did it together. Don't like it? Come get some."