Earlier quoted context omitted.
Given how the situations w.r.t Ukraine & Iran escalated, the US is the only country that has specifically and publicly demonstrated it's inability on both counts. We can't give Ukraine their nukes back because they were decommissioned (and they were rotting at the time), but there'd be no nation more deserving. Corollary: no individual nation is able to shoulder such responsibilities.
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Sure, everything is fine. I am sure Iran will be a peaceful democracy any day now.
In reality, none of Trump’s stated goals are likely to happen any time soon.