Why these specifically? Why Poland and not Slovakia, Romania or Moldova that also neighbor Ukraine? These countries have much weaker conventional defenses than

Why these specifically? Why Poland and not Slovakia, Romania or Moldova that also neighbor Ukraine? These countries have much weaker conventional defenses than Poland, further increasing the importance of something like nuclear weapons. I would go even further. All countries that used to be part of the USSR and got violated by USSR for decades without any external help would be wise to develop at least the capability. In secret if need be.