§ 120. The procedure for the conduct of relations of the Republic of Estonia with other states and with international organisations shall be provided by a law.
§ 121. The Riigikogu shall ratify and denounce treaties of the Republic of Estonia:
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which alter state boundaries;
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the implementation of which requires the adoption, amendment or repeal of Estonian laws;
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by which the Republic of Estonia joins international organisations or unions;
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by which the Republic of Estonia assumes military or pecuniary obligations;
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in which ratification is prescribed.
§ 122. The land boundary of Estonia shall be determined by the Tartu Peace Treaty of 2 February 1920 and by other international border treaties. The sea and air boundaries of Estonia shall be determined on the basis of international conventions.
The ratification of treaties which alter the state boundaries of Estonia requires a two-thirds majority of all members of the Riigikogu.
§ 123. The Republic of Estonia shall not enter into international treaties that are in conflict with the Constitution.
If laws or other acts of Estonia are in conflict with international treaties ratified by the Riigikogu, the provisions of the international treaty shall be applied.