however, a scheme in which it could happen is that Europe sends troops from countries including NATO countries to Ukraine. Then Russia attacks those troops in Ukraine. The troops fight back. Then Russia cries foul and attacks the troop sending countries, including troop sending NATO countries. Then NATO could claim to be under attack from Russia and invoke Article V military support.That is what I already posted. A brigade deploys from a European country to Ukraine, gets into a battle with the Russians, needs reinforcements from home. Russia stops the troop movement with a missile in the home country which NATO then claims is an Article V transgression and we're all toast.
Cue Fred Thompson.