The only time Art 5 was invoked was in redponse to 9/11. NATO countries sent military forces to join US forces in fighting the Taliban. Many instances of the heroism and effectiveness of those NATO troops were often highlighted here on FR.
It seems to me that the key point is that if a NATO member is attacked, then other NATO members are authorized to respond.
So who got attacked? Well, Ukraine was invaded by Russia.
And someone blew up Russia’s pipeline.
Help me out here ... I’m not spotting the NATO member who was attacked. Why is anyone talking about Article V?