Ukraine wants to join NATO during a military conflict, as a NATO member I would propose the following solution. Ukraine should firmly assume the borders it controls, and with these it joins NATO. BUT ! unofficially! with those it does not control.
NATO would have the possibility to apply Article 5 on the territory controlled by Ukraine, but on the front line ONLY Ukraine would fight with the alliance's guarantee that it would have no more territory to lose.
If NATO troops do not enter into direct conflict with Russia and only the Ukrainian army fights, I believe this would lead to a greater and safer advance for the Ukrainian forces, as they could also use the army near Moldova/Transnistria.

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