This was posted elsewhere but it’s relevant to mention the US already stated it would sell inferior versions of jets. Im sure these countries realised the current US mentality of “why stop there” and will probably cost cut further - lesser quality munitions and firearms, land vehicles, specialty fuels, etc.

Also in the face of tariffs and regular insults, being less inclined to purchase from someone increasingly hostile to them. This isn’t “out of the blue”, it’s the response step.