There is a curious dispute between Croatia and Slovenia in regards to their land and maritime border. It appears to be ongoing since the breakup of Yugoslavia.

Noticeably Slovenia tried blocking Croatia’s bid to join the EU up until 2013, when it appears they stopped trying?

From there on it appears that everyone was okay, even Slovenia, with Croatia joining and staying in the EU even though the issue was never resolved.

In short, other factors, more valuable than the border dispute, must have motivated, or pressured, Slovenia to give up vetoing Croatian membership.

What could have possibly been more important to the Slovenians or its leaders?

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    Have you read this Wikipedia article? en.wikipedia.org/wiki/Croatia–Slovenia_border_disputes – Don Hosek Mar 20 at 3:41
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    There are quite a lot of bits of historical baggage in the EU. Spain claims Gibraltar and the Republic of Ireland had a claim on Northern Ireland in its constitution for many years. Also Poland is still claiming hundreds of millions of Euros from Germany in reparations for WWII, and Greece would like the Elgin Marbles back. As long as nobody starts threatening violence this is all fine as far as the EU is concerned. – Paul Johnson Mar 20 at 15:49

The rule regarding EU accession and unsettled border disputes is simply that the EU does not want to get dragged into ongoing border conflicts by new members. It is not an absolute, automatic bar to EU membership. There is also an "ongoing" border dispute between Germany and the Netherlands. But things are sufficiently amicable that both are EU members in good standing.

  • How would judicial jurisdiction work for the disputed territory? Would the courts for both countries or neither countries be recognized? – M. Y. Zuo Mar 20 at 16:46
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    @MichaelZ, cases like this in Europe tend to be about river bottoms, mountain tops, or tidal mudflats. – o.m. Mar 20 at 18:53
  • And what does that imply for jurisdiction? – M. Y. Zuo Mar 20 at 22:49
  • @MichaelZ, for things like barge traffic or fishing there are treaties. And I'm not aware of any murders on ships in disputed rivers. – o.m. Mar 21 at 6:58
  • What jurisdiction do these treaties assign as the predominant one? Or is it a condominium? – M. Y. Zuo Mar 21 at 16:49

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