No idea what the reasons are in this specific case, but these kinds of military procurements are inherently tied to the political side. Planes like this quickl

No idea what the reasons are in this specific case, but these kinds of military procurements are inherently tied to the political side. Planes like this quickly become paperweights if you can't get replacements parts, support and ammunition. And most buyers won't be able to get significant parts of the construction into their countries. So you must trust the political stability of the country you're buying from, that they're still your friend in a decade or a few and support your planes. Trump and his administration are anything but reliable partners.