The constitution paves the way for the transfer of increasing amounts of defense and diplomatic activity from Europe's national capitals to Brussels. Article 1-16 commits all member states to a "common foreign and security policy." "Member states" are required to "actively and unreservedly support the Union's common foreign and security policy in a spirit of loyalty and mutual solidarity and shall comply with the Union's actions in this area. They shall refrain from action contrary to the Union's interests or likely to impair its effectiveness." In a recent radio interview, Spanish prime minister Jose Zapatero explained how this might work:...