One could require that Russia return annexed lands to Ukraine for this to happen.
P.S. Russia did want to join NATO. See https://www.theguardian.com/world/2021/nov/04/ex-nato-head-says-putin-wanted-to-join-alliance-early-on-in-his-rule
20 comments
Ask HN: Would quickly accepting Russia and Ukraine as NATO members end the war? | Heykuki News