Austria vs. Slovenia

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since the breakup of Yugoslavia in the early 1990s, Croatia and Slovenia have each claimed sovereignty over Piran Bay and four villages, and Slovenia has objected to Croatia's claim of an exclusive economic zone in the Adriatic Sea; in 2009, however Croatia and Slovenia signed a binding international arbitration agreement to define their disputed land and maritime borders, which led Slovenia to lift its objections to Croatia joining the EU; in June 2017 the arbitration panel issued a ruling on the border that Croatia has not implemented; as a member state that forms part of the EU's external border, Slovenia has implemented the strict Schengen border rules to curb illegal migration and commerce through southeastern Europe while encouraging close cross-border ties with Croatia; Slovenia continues to impose a hard border Schengen regime with Croatia, which joined the EU in 2013 but has not yet fulfilled Schengen requirements