Superpower (being only one power in world) is a meaningless term as real power is not weapons, but, economy.
So, Poland can be power only like other powers, but, this means Poland need to cooperate with Israel.. All other options will make Poland weak as all other options (USA, Russia, etc) are powers based on weapons and weapon power is not a real power anymore in this era.
Superpower is a power which can strike any place on earth without huge problems of transportation and not lose all of your transport :)
(like GB during colonial times or U.S.A during cold war)
Also one can be a Superpower by controlling everyone by their balls or their wallets ;)
A local war can start as a local one and end like a local one. As long no major players will have any interests in joining it.
Let's say Poland and Lithuania walk out of NATO and Poland invades Lithuania!
(Russia would be immobilized because of NATO while Germany at the other hand has such a terrible experience from WW2 that even on expeditionary missions they have to have forces next to them from a foreign country)
Unless Belarus would use that situation and invade Poland with hidden Russian assistance.
There is much to think over it, yeah :)