This open access book investigates, analyses, and discusses the emerging issues of investment and the EU legal order. Europe has historically had an open approach to investment, but evolving geopolitical considerations over the past decade have seen this classical open approach being increasingly replaced by a more protectionist stance. Leading scholars, civil servants and practitioners assess the implications of this change, taking a four part approach of framing investment, arbitration, sustainability, and future developments. The collection's expert insights and ambitious scope ensures its appeal to investment lawyers both within and outside the European Union.