It doesn't obligate members to respond militarily, it obligates NATO members to consider an attack against a member as an attack against them. Retaliation and any other action needs to be discussed by NATO members and can also be vetoed.
A lot of people seem to think that if article 5 is brandished, war will result, it absolutely depends on what the council will agree upon.
A lot of people seem to think that if article 5 is brandished, war will result, it absolutely depends on what the council will agree upon.