The full political consequences of the decision by British voters to pull their country out of the European Union will be not be evident at first. However, it is now clear that the British referendum has moved a number of questions that had been languishing for years or even decades in a state of limbo awaiting a final decision, back onto the international agenda. Those issues include the problem of Gibraltar, a dilemma for both the UK and Spain, which could under certain circumstances also become a problem for the European Union and NATO (Gibraltar is the site of a NATO naval base)…