General Discussion

If the US wants to dabble and play world police force/gangster in such a scenario, it can do so without its hitherto allies. Without its customary European staging posts, that could present severe logistics problems unless arrangements outside the current NATO framework were substituted, and those would likely come with quid pro quos.

It could also lose the contribution to intelligence gathering provided by its current allies. There are suggestions those feeds have already been curtailed as a result of suspicions about the Trump regime's motives and reliability.

Already there have been moves to lessen the reliance on US weaponry in favour of materiel produced indigenously and elsewhere. That would only accelerate if the US was excluded. That's quite a lot of revenue to forgo.

The Ukraine conflict has highlighted shortcomings in US artillery supplies, for instance, and inventive recourse to sources elsewhere has very largely filled the gap. As for drones, the US looks very flatfooted and outdated compared to Ukraine and members of the "coalition of the willing".

If it's a choice between an unreliable, if not treacherous, "partner" and having to dig deeper to fill its shoes, under Trump at least, that would seem a more attractive option.