I've read it the first time. The aggressor in a war isn't determined by the territory where the war is fought. In WW2, the war wasn't fought on US soil, rather US was fighting it on German and Japanese soil. That doesn't make USA the aggressor in the war.
So, if Romania declares war on Russia, and Russian army repels them and crosses the border into Romania in order to defeat them, NATO still isn't obligated to declare war on Russia. They may decide to do it, but they're not obligated.
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