Not the parent, but getting US to quit NATO won't help his European ambitions. Russia is weak now, and has solidified the European hostility for years to come.

"European hostility" is not going to matter when there's no EU. No matter how weak, Russia will always be stronger in terms of the number of warm bodies they are ready to throw into the meat grinder than any country in Europe.

UPD: If you don't believe me, look at the European right-wing leaders (including a sitting head of state, Meloni) currently banding up behind Orban, a widely known Putin's shill in Europe.