Biden used to seriously put on a big shit eating grin after every sentence though, it was like his trademark. he’s just so far gone at this point even compared to four years ago.
It's from the NATO treaty, "Article 5 provides that if a NATO Ally is the victim of an armed attack, each and every other member of the Alliance will consider this act of violence as an armed attack against all members and will take the actions it deems necessary to assist the Ally attacked."