RIP NATO, or at least, a US-led version of it.
We need to up our spending more than already committed to, and spend as little of it as possible on US supplies/expertise. I'm not convinced we can even rely on them to service the kit we already have.
Forge closer ties with the EU, Canada, Australia etc.
Between the rest of NATO, we also need to train up and agree on leadership roles and coordination.
Europe can't afford to let Ukraine fall, and we have to cut the US out of any of our thinking, and reduce reliance as much as achievable.
There's a job vacancy now for "leader of the free world" the EU surely has to take that on, or we're all screwed