The real question is whether you see any strike on Ukraine as a new, separate attack or rather as the continuation of the attack from the 24th of February 2022.
In the latter case, which makes more sense, Article 5 of the North Atlantic Treaty would only be triggered if a third party entered the war on the side of Russia. Continuing attacks from Russia wouldn't trigger collective defence of NATO since when Ukraine was attacked it wasn't part of NATO, yet.
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