NATO is the threat. The US cannot simply lie about NATO's good intentions, because in Eastern Europe they are not.
It's unfortunate that Russia has to use "the war" mechanism to prevent the expansion. But such mechanisms are widely used across the globe.
If you stop the US, you'll stop the war.
If you stop US pouring my money into Ukraine, right that minute Ukraine will enter into negotiations with Russia.
There is no need to throw more gas into the fire.