I’m not suggesting Poland take back Lwow, or anything of that sort, but certainly to assist Ukraine and protect Poland’s borders, and let Putin know they won’t get all of Ukraine cheaply. I would believe a good number of Ukrainians want to be a fellow EU member with Poland.
but even the merest sight of Polish soldiers on Ukraine will bring up propaganda and I doubt Ukrainians would want to see them — the history books talk too much of “the Poles” — distorted history.