Here is an interesting recent article from which you can better understand what place Poland occupies or wants to occupy in this conflict. It is about a possible union between Poland and Western Ukraine, on the territory of which Poland has claims for historical reasons. Moreover, since 2015, an organization for the return of Polish property in Ukraine "Restitution of Kresov" has been operating in Poland, and about 100 thousand Poles are able to prove that they are the heirs and successors of people who owned real estate in Western Ukraine. And in 2016, Ukraine signed, together with the Sejm of Poland, a joint declaration condemning the Molotov-Ribentrop Pact. By signing this declaration, Kyiv actually abandoned the six regions of Western Ukraine in favor of Poland, which Ukraine received under this pact.

Now it is more clear to me why Poland is so determined and seems ready to take a direct part even without coordination with NATO. This is a historic chance for Poland to become the "customs office of Europe" with physical control over two branches of the gas pipeline from Russia to Europe instead of the current one.