Then one could also argue that no NATO country has ever fought off Russia.
Ukraine barely stopped the Russians, even with the massive help of NATO (both before and after the 2021 invasion). It doesn't follow at all that NATO thinks Ukr is a member. Ukr is just that - a buffer country that should not be taken by Russia. This is not meant in an offensive way, think of it as a neutral country like Switzerland or Austria.
Ukraine barely stopped the Russians, even with the massive help of NATO (both before and after the 2021 invasion). It doesn't follow at all that NATO thinks Ukr is a member. Ukr is just that - a buffer country that should not be taken by Russia. This is not meant in an offensive way, think of it as a neutral country like Switzerland or Austria.