system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Turkey said, they're going to defend Gaza against Israel. As a NATO mebmer, could they call Casus Foederis?

What would happen if they did? What would pro-Israel countries like Germany or the US be supposed to do? If Israel as a non NATO state attacks a NATO protected country, wouldn't they have to help agains Israel?
gpt
No way. NATO would never consider this a valid case of self-defense, which is what Article V of the NATO Charter is for. 

Art. V reads:

> 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.


In no way would this be considered "an armed attack against one or more of them." Hell, Turkey has a better case for going to war against Syria because of their errant mortars. 

When Art. V is invoked, the NATO signatories get together to determine if it really was an attack that disrupts the peace, which is where this effort would die pretty instantly. 

But, let's follow the hypothetical. Even if NATO as a whole decided that this was somehow an attack against Turkey, then yes, even pro-Israel countries like the US would be required to help Turkey. However, the issue is that each country gets to decide for themselves what an appropriate level of "support" entails. So the US could give Turkey a dollar and say "Yeah, we think that's sufficient to defend yourselves" and be done with it. Furthermore, it would then go to the security council, where the US would promptly quash it, thus invalidating any "NATO" response.