The Illyria myth is nice, but baseless, ridiculous and preposterous. The Romans had long since wiped most of the Illyrians off the face of the earth (see Illyrian Wars; 229BC and 219BC; final destruction 169BC). The Albani were just one of the dozens of Illyrian tribes (who sharedthe Balkans with some Celtic and Venetic tribes, such as the Histri, Liburni, Colapiani...) and they NEVER inhabited any lands north of the present-day south-central Albania. Therefore, their historical "right" to Kosovo-Metohia is non-existent.
The Serbs certainly weren't the first ones to live in Kosovo, but they got there at least 750 years before any Albanian ever set foot in Kosovo-Metohia. The Serbian towns and the names of those towns, as well as of Kosovo's rivers, valleys, mountains, hills, etc; the hundreds of churches, monasteries, etc all bear witness to the Serbian origin and ownership of today's Kosovo-Metohia. It has been inhabited by Serbs since the 6th century.
To this day, the Serbian government has the deeds to some 60% of Kosovo-Metohia, whereas the Serbian Orthodox Church owns the rest (Metohia; private property donated to the SOC by Serbia's mediaeval nobility and/or state).
Kosovo is Serbia. Plain and simple.
In view of the above, ask yourself why it is that the career-level bureuacrats in the US State Department (and in the EU) are unable to understand how plain and simple it is to know that Kosovo is Serbia.