Pakistan Defence Industries - Updates

Why is the US suddenly kicking up a fuss about the Pak missile prog? Back in the 1990s, they flew NoKo liquid-fuelled missile components (on a C-130, no less) right under their noses to Pak and re-badged them as Ghauri. Their Shaheeen series has Chinese origins - clear violation of MTCR, etc. Not a word from the US..

Now, what space-age tech has Pak suddenly pulled out of its a** for the US to go bonkers?