Expropriation in international investment law is the compulsory taking of foreign investors' assets by a host state, balancing sovereign rights with investment protection. It includes direct and indirect forms, requiring fair compensation and due process.

The regulatory taking doctrine in international investment law mandates compensation when state regulations significantly impact investments, even without formal expropriation, balancing sovereign regulation and investor protection.

The doctrine of regulatory taking in international investment law ensures compensation when state regulations significantly impact foreign investments, even without formal expropriation. Balancing sovereign regulation and investor rights remains a key challenge.