Poland is a NATO member, and there's rampant speculation about the implications of this incident.
The reported strike could pose a major test to Biden's vow to defend "every inch" of NATO territory.
Biden's vow could be facing its biggest test yet following fatal strike in Poland, a NATO ally, that the Polish foreign ministry said involved a "Russian-made missile."
"When it comes to our security commitments and Article 5 we've been crystal clear that we will defend every inch of NATO territory," Pentagon spokesperson Brig.
To fire missiles at NATO territory!