"cause them to be regulated under ITAR and be non-exportable without a license". Even more complicated because they are US designs manufactured overseas, and I'm sure the design team includes a lot of non-citizens, so there are ITAR violations during design and production as well as (re) export.

Possibly the International Traffic in Arms Regulations? I only know this because at one time strong crypto was a munition in the US and these regulations specify what gets classified as such.