Introduction.- Chapter 1 Squaring the circles: How to understand national security, critical infrastructure, vital societal functions, and the foreign ownership challenge?.- Chapter 2 The European approach to screening procedures: Leaders and laggards.- Chapter 3 Geographical dwarf, FDI giant - Protecting security and prosperity: The peculiar case of the Netherlands.- Chapter 4 Foreign investments and national security: Finland's approach.- Chapter 5 Undermining liberal international order? The balancing act between attracting foreign direct investments and protecting national security interests in the US and the UK.- Chapter 6 Foreign investments and national security: The case of Russia.- Chapter 7 Foreign investment and evolving security concerns: The case of China.- Conclusions.