US lawmakers call for Biden to allow Poland to down Russian missiles over Ukraine

For anyone wondering why Biden would need to approve this, here's an excerpt from the article:

While Polish Foreign Minister Radoslaw Sikorski said at the time that the matter was still under discussion, Defense Minister Wladyslaw Kosiniak-Kamysz explained that a decision by all of NATO's member states would be necessary to take this step.

Why does Poland has to ask for the permission of the US to shoot down missiles in their neighbour country, which would be fine by it?

What has the the US even to say about that?

Even considering a NATO thing, Poland is still able to act as they see reasonable.

I'm really not sure what to make of this and am asking myself mostly wtf?, or if I've just missed something of a geopolitical agreement here, that I haven't known of.