You might read this article initially thinking it is just the US snubbing Ukraine yet again, but the real answer is laid out in black and white if you read further:

An Iranian Shahed is said to cost $20,000 to $50,000, depending on the model. The Ukrainian interceptors are even cheaper. Concerns about intercepting such a cheap, simple target with a multimillion-dollar munition spiked during U.S. fights against Houthi rebels in Yemen, and have remained high since.

You can practically hear the US MIC breathing heavily in the gallery during these talks. The wars in Iraq and Afghanistan transferred trillions from US taxpayers to military contractors over 20 years, but a belligerent the size of Iran with modern warfare techniques could realize that dream again in 5.