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Can a country be allowed to nationalize every assets the countries has under private ownership from foreign investors according to international law? Let's say that the assets were bought under a corrupt government and that the new government want to right the "wrongs". Is there any international law against asset seizure without compensation?

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  • There was some history in the late 20th century of developing nations asserting their right to control natural resources (in the post-colonial context), and trying to formalize it into a legal principle. See NIEO wiki for instance. The UN General Assembly adopted these principles at the time. I suspect most of the big trade treaties since then have been moving in the opposite direction, overall trying to secure the property rights of international investors.
    – Pete W
    May 28 at 18:39
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The technical term for nationalization1 is expropriation and states have an inherent right to expropriate property owned by aliens. Claiming that it is a right is quite a strong claim, but it how it is. From chapter Expropriation in Principles of International Investment Law (2nd Edition) :

Consistent with the notion of territorial sovereignty, the classical rules of international law have accepted the host state's right to expropriate alien property in principle. Indeed, state practice has considered this right to be so fundamental that even modern investment treaties (often entitled agreements "for the promotion and protection of foreign investment") respect this position. Treaty law typically addresses only the conditions and consequences of an expropriation, leaving the right to expropriate as such unaffected.

These strong words means that there is, in principle, a right to expropriation which is comparable to the right to self-defense.

The chapter continues with a discussion on what is required for an expropriation to be lawful:

It is today generally accepted that the legality of a measure of expropriation is conditioned on three (or four) requirements. These requirements are contained in most treaties. They are also seen to be part of customary international law. These requirements must be fulfilled cumulatively:

a )The measure must serve a public purpose. Given the broad meaning of ‘public purpose’, it is not surprising that this requirement has rarely been questioned by the foreign investor. However, tribunals did address the significance of the term and its limits in some cases.

b) The measure must not be arbitrary and discriminatory within the generally accepted meaning of the terms.

c) Some treaties explicitly require that the procedure of expropriation must follow principles of due process. Due process is an expression of the minimum standard under customary international law and of the requirement of fair and equitable treatment. Therefore, it is not clear whether such a clause, in the context of the rule on expropriation, adds an independent requirement for the legality of the expropriation.

d) The expropriatory measure must be accompanied by prompt, adequate, and effective compensation. Adequate compensation is generally understood today to be equivalent to the market value of the expropriated investment.

In your example, the asset was expropriated without compensaion and would have been unlawful. Exactly how much a state should pay for expropriated property is a thorny subject. You can read more about it in Compensation for Expropriation Best Practices Series - March 2013 published by the International Institute for Sustainable Development and in Expropriation: a Sequel published by the UN body UNCTAD. The latter writes:

The last condition for an expropriation to be lawful is that it must be accompanied by compensation. Different methods of valuation may be employed to determine the amount of compensation (see sections I.F.4(iv) and III.B) and may lead to varying results. The differences between compensation for lawful expropriation and reparation for unlawful expropriation are discussed separately in section III.A.

In recent IIAs, there is an increasing level of convergence regarding the standard of compensation that must be paid to render the expropriation lawful. One of the salient trends among IIAs is that most of them incorporate the standard of prompt, adequate and effective compensation, also known as the Hull standard (see UNCTAD, 2007, p. 48).

Compensation is considered to be prompt if paid without delay; adequate, if it has a reasonable relationship with the market value of the investment concerned; and effective, if paid in convertible or freely useable currency. In spelling out what constitutes an adequate compensation, treaties most often refer to an investment’s fair market value.

  1. Actually, it is more correct to say that nationalization is a form of expropriation. From a legal standpoint, nationalization and expropriation are equivalent, but nationalization often has a political purpose which expropriation doesn't.
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What you describe is similar to the theory of odious debt. It had some success, but not very much. Countries can default on debt, but they cannot easily operate on the international markets afterwards. Nationalizing property is a slightly different thing, but the same principle applies.

  • Many countries have signed treaties to protect foreign investment. Breaking those treaties carries a stiff political and economic price.
  • Even without specialized treaties, there are general trade agreements like the WTO which also provide some investment protection. Again, leaving those carries a political and economic price.

On the other hand of the coin, a country might turn against some rather than all investors, seize their property, and call that a political sanctions regime. They'd hold the property, not nationalize it, until things get cleared up in the distant future ...

It would matter if the property was seized with or without compensation, if the compensation is more than a token, if the seizure is called permanent or not, and how the international community viewed the investors and the country in question.

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