I seriously doubt NATO will allow Ukraine to join for the reasons I laid out, but Ukraine does not have to join anyway. NATO is already providing a lot of support in terms of training and military equipment. Several NATO countries have troops in Ukraine for the training mission.
Ukraine armed forces are already much more capable than in 2014-15. Back then, UKR had a lot of obsolete equipment, poorly trained troops, corrupt officer corps. Now, they have a lot of brand new U.S. vehicles, supplies, equipment, many of their troops have received extended NATO training. For example, Ukraine now has several hundred Javelins ATGMs which would put a serious dent in Russian forces should they launch an offensive.
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