A part of the NATO treaty could turn Russia's invasion of Ukraine into a wider war
Article 5 of the North Atlantic Treaty means that an attack on one member state is determined to be an attack on all. Ukraine is not part of the alliance — but some of its neighbors are.
As Russia began its invasion of Ukraine, some U.S. officials and analysts were already warning of a possible escalation of the conflict into a wider war.
The trigger: Article 5 of the North Atlantic Treaty.
As the fighting continues, we unpack what Article 5 is, what could invoke it, and the places and people to watch.
What is it?
Article 5 is a key pillar of the 1949 North
