The war with Ukraine is an incredibly delicate situation and requires something reddit is terrible with: nuance.

NATO can do a lot, but with Russia being a nuclear power means there is an upper bound that both sides can escalate conflicts without leading to a potential nuclear armageddon. You can do a lot to slow down Russia, their economy is massively limited and politically have been isolated however an all out war would lead to a nuclear holocaust.

You can't just simply invade Russia, it would lead to massive knock on effects with China possibly fearing invasion leading to increased tensions, same with Iran and North Korea.