Maastricht: Trichet worried by euro 'unease' Jean-Claude Trichet, former chief of the European Central Bank and one of the architects of the Maastricht Treaty, adopted 20 years ago, says he is worried by EU-wide 'unease' concerning the euro, but remains optimistic that 'the story is not over'. Maastricht came into force on November 1, 1993, committing member states to an ambitious programme of closer political and economic cooperation, all coordinated in Brussels and ultimately leading to the single currency. IMAGES AND SOUNDBITES.