The headline is incredibly misleading. There is no crack in the alliance. Poland was among the first to contribute weapons, and they did so until it hurt. They are simply out of extra stuff to give. As well, Poland is also keenly aware that they are next on Russia's list, so they have been rapidly accelerating their own up-arming. In order to be prepared for the expected conflict through Belarus, Poland has to switch all their focus to fortifying. Their pile of physical stuff is not as big as the rest of NATO, and in holding nothing back, they have depleted it. But the political myopic wishful thinking that this somehow means Poland has given up on supporting Ukraine is purely fake news political spin attempting to sway the weak-minded.