FAA training required.....
The issue concerns the issuing authority of the license, the registration of the aircraft, and the type of flying (135/121, etc), being conducted.
I have flown PARs for many years as military, and civilian. If the operations are conducted in a N registered aircraft, by a FAA licensed pilot, under Commercial operations, then Op Spec DO apply no matter what YOU think you can do. Under the FAA regs, to be PIC of an aircraft in commerical operations there are Instrument checkrides required every 6 months. The regs state that the PIC must demonstrate proficiency in EACH type of Precision Approach that will be authorized. So, evaluated must be annotated on the 1099 that they have demonstrated proficiency in flying an ILS and a PAR (if authorized in the Op Specs). A company even though authorized in the Op Specs can elect to not conduct a PAR, and therefore not train or check those. However, if the 1099 does not reflect the PAR each 6 months then the pilot is not authorized to conduct the PAR (unless of course applying Captain's emergency authority.).
So, it isn't an ATC issue. There is training involved as is required for any other type of procedure.
In a foreign country there is more than just training involved. Since the PAR is based on language, doing a PAR in a country where English is not the primary language needs to be evaluated. This is one reason my present company has elected to NOT do PARs, in addition to authorization issues.