Well and good. Article 5 of the NATO charter
The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defence recognised by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area.
Any such armed attack and all measures taken as a result thereof shall immediately be reported to the Security Council. Such measures shall be terminated when the Security Council has taken the measures necessary to restore and maintain international peace and security.
We had better be able to walk the talk if Russia invades Georgia or Ukraine, including willing to go to war in defense of a fellow NATO ally. Geographically, it will be very difficult to confront the Russians in Georgia and Ukraine. Nuclear confrontation is probably the only the way to carry through on NATO's commitment.
Our support of an independent Kosovo, a predominantly Muslim state in the heart of Europe, and controlled by the KLA, a terrorist organization, is not exactly in our best interests. I would prefer Russian control rather than KLA control.
Yes, Article 5 is a powerful deterrent against Russian aggression. If Georgia had been admitted into NATO already, the Russians would not have crossed the line.