Albania, Montenegro, Serbia, Turkey, and the Former Yugoslav Republic of Macedonia are official candidates for EU membership (European Commission). In March 2015, Iceland withdrew from the EU membership process (Euractiv, European Commission), and the UK's vote to leave the EU has heightened concerns that enlargement may stall. _{Confused? Check our FAQ or ask us for help.}

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_{If you liked this question, you might also enjoy forecasting on whether any other European Union (EU) member state will set a date for a referendum on leaving the EU or on whether the U.S. will suspend immigration from any country designated as a state sponsor of terrorism or a terrorist safe haven.}