What to name a (new) country?

This week Europe (except Spain, Romania, Greece and some other countries) got a new state, when the province formerly known as Kosovo declared its independence from Serbia (17 February). But what will it be called in the future? The Serbian name of the new country is Kosovo and Metohija (Kosmet for short). In Albanian, it is known as Kosova. International media refer to it simply as Kosovo, except for those – Radio Free Europe, for example – who want to make a point and call it Kosova. So what will the EU states do?
In the immediate aftermath of the declaration of independence by Kosovo/a, neither the EU's Council of Ministers nor the Commission's directorate-general for interpretation issued any instructions to change from the Serbian name to its Albanian variant. A senior Commission official told European Voice that interpreters and translators would follow the usage in Council of Ministers documents (ie, Kosovo) and that as a rule, they would refer to any country by its established name in the target language (‘Frankreich' in German rather than ‘France'). Officials might take comfort from some evidence that even the Kosovar authorities do not appear so sure about what to call their own country. On his website, Fatmir Sejdiu is identified as “President of Kosova”. Hashim Thaci's website describes him as “Kosova's Prime Minister”. But the main government portal refers to the “Kosovo institutions”, listing the “Presidency of Kosovo” and the “Office of the Prime Minister of Kosovo”.