ENIn this chapter, the authors present the current state of national legislation in Poland, Lithuania and Latvia enacted to protect national and public security in the context of foreign direct investment (FDI). The authors discuss the following aspects related to FDI screening: investors subject to screening, protected objects, transactions subject to screening, screening criteria, competent authorities, procedures, administrative/judicial review and consequences of unlawful transactions. Thereafter, an analysis of the different national legal regimes is made in the light of the EU Screening Regulation.