Entity: NATO
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NATO

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U.S. officials have raised concerns that the United States may be unable to control how weapons are used after they are sold to allied third-party countries (for example, NATO members) and then transferred onward to another country such as Ukraine.
September 26, 2025 high temporal
Policy concern about post-transfer control of weapons sold to allies and subsequently re-transferred.
NATO's Article 5 is a mutual defense clause committing member states to treat an armed attack against one member as an attack against all members.
high temporal
Definition of NATO's core collective-defense principle.