The risk of the conflict in Ukraine expanding further into Eastern Europe escalated on Nov. 15, 2022, with reports of a Russian-made missile straying into neighboring Poland.
It was not immediately clear if the apparent strike – in which two people were killed – was intentional or accidental, or where the missile had originated. Later, the Polish president said that the projectile likely originated from Ukrainian air defense. Nonetheless, concern that a member of the North Atlantic Treaty Organization, or NATO, could become further embroiled in the conflict led to questions over whether Poland may invoke Article 4 or Article 5 of the NATO treaty if attacked – something that could lead to military intervention by other member countries.
