ATS provided in Kosovo falls under the jurisdiciton of ICAO's Technical Co-operation Bureau on behalf of the UN and others.
Go to
http://www.icao.org and use the search function found under the 'Strategic Objectives' section for "Kosovo". It'll turn up a power-point presentation on what the TCB does and where it does it, including Kosovo. (Note - you'll need a current version of MS Internet Explorer for it to work).
Kosovo remains legally part of Serbia & Montenegro but in reality Serbia has no longer any real jurisdiction within Kosovo which may account for the fact that the ICAO location ID for Pristina is not of a Serb/Yugoslav 'LY**' type. You might therefore find that the BKPR stands for Balkans, Kosovo, PRistina and is a temporary designator until such time as the region's future is resolved fully. (i.e remains part of Serbia, becomes part of Albania or does its own thing entirely).
Rgds
T3
PS Another geographic anomaly is the last remaining French territory in North America, St Pierre-et-Miquelon - a stones throw off the south coast of Newfoundland: LFVP and LFVM. You'd think that following the Caribbean xample of 'TF**' for French territories they should be 'BFVP' and 'BFVM' instead of 'LF....', but who am I to say...