I said it on another thread, but only a fool would believe a promise from Uncle Sam when it comes to war. We change administrations and governments every 2-4 years so a promise today has a short shelf life.
Just ask the Afghans, Iraqis, Libyans, Syrians, Kurds, and Montagnards how it worked out for them. While none of them were “perfect allies” we pulled the rug out from underneath them when it became politically expedient to do so.
I would NEVER trust any American diplomat.