If NATO territory is attacked, then obviously NATO would retaliate as that is the very purpose of NATO, but some sources were saying that Jens Soltenberg extended that to attack on the convoys inside Ukraine as well:

> “Today, the head of NATO… Mr. Stoltenberg has made a statement: if a single projectile, a single bullet hits a convoy that … [is delivering arms] to Ukraine, [NATO] will consider it a trigger for Article 5 [of the North Atlantic Treaty],” Danilov said while on air on Rada, the Ukrainian parliament's TV Channel.

https://www.farsnews.ir/en/news/14001222000658/Kiev-Claims-N...

I know that is not the most truthworthy source of course.