The term G4 is especially (although not only) used to describe meeting of the four nations at the leaders' level. In addition, the term EU three (or G-3) is used to describe the grouping of foreign ministers from France, the UK and Germany (now re-unified) during the Iran nuclear talks. On the other hand, the grouping of interior ministers that includes Spain and Poland is known as the G6. Germany (which has the largest economy in Europe) is often regarded as the EU's economic leader, such as with the ongoing European sovereign debt crisis, whilst France and the United Kingdom (both permanent members of the UNSC) often lead in defence and foreign policy matters, such as the intervention in Libya in 2011. This, to an extent, represents a balancing of leadership power for the Western sphere of the continent. How this balance will change after the Brexit vote in 2016 is still an open matter.