Against Russia? Definitely not. However, if they so insist, they can learn it from France immediately or make their own within a few years. After all, Marie Curie was Polish. They sure have enough smart people to make it happen. France taught Israel nuclear weaponry before. That’s why I insist that whenever you need friends, you speak to the French first.
Why not nuclear weaponry? Russians are quite nomadic. Strategic nuclear weaponry targeting at fixed locations doesn’t do much harm to Russians. They even are capable of burning down Moscow on their own just so that you die in the cold Russian winter. Without an actual army to defend Warsaw, Russians will simply seize it as their temporary capital. They will show no mercy, because Poland has nuked their land. This is probably the worst-case scenario to run into. Definitely avoid it at all cost.
Europe, Asia and Africa are all interconnected. It’s all about a strong ground force with good support from an air force capable of air superiority, which is secondary.
Tactical nuclear weaponry targeting at a mobile ground force is, however, a good option. It takes a bit of creativity to design your own army to suit your national defense needs. By the way, tactical nuclear weaponry is still a theory. It’s not proven yet in real wars.
Survival matters. If you can’t even handle survival, there’s no need to worry about prosperity.