Under Article 4, which was invoked by Russia's invasion of Ukraine, the NAC can formally lead a joint response to any threat to any member (prior to any war). T

Under Article 4, which was invoked by Russia's invasion of Ukraine, the NAC can formally lead a joint response to any threat to any member (prior to any war). This led to a bunch of logistic support and prepositioning for closer NATO nations. It also led a joint decision for military material support for Ukraine, under the theory that it was cheaper support Ukraine today than fight Russia later.