Article 5 Only states that NATO countries will take an engagement if one of it's member is under attack(this, I believe, just happened). Each member has control over what kind of involvment it takes.
I sincerely hope that my f***ing government is going with this all the way, Measures haven't been chosen yet. They better do, or they will end up with a lot of unhappy countrymen.
Saw
(Brussels)