Article 5 is only valid if the NATO country is attacked and not the attacker
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eg. if Turkey attacks Israel don't expect  USA or Canada or UK to support Turkey if Israel retaliates
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The first time that Article 5 was used was to help the US in a war that started with the attack on Palestine to take land for Israel. Financed by the US. Arms supplied by the US.
Art Campbell
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I don't follow
Israel and Palestine are both not NATO countries
and they were not attacking USA
so how does Article 5 kick in?