The whole war was started because the Russians consider Ukraine in nato to be their red line, and the war was lost by Ukraine because the NATO leadership never seriously considered putting Ukraine in NATO if that meant direct war with Russia.

So no, it isn't a realistic goal at all. The war ends only when either

1. The Ukrainian state collapses
2. A deal is made in which Ukraine does not join NATO
3. Ukraine pushes back Russian forces so much that they collapse the Russian government.

Scenario 2 seems to be the most likely outcome.