defined in Article 2 various acts as aggression, including naval blockades. The Convention also stipulates that "No political, military, economic or other consideration may serve as an excuse or justification for the aggression referred to in Article 2." Estonia Estonia adopted the Estonian Declaration of Independence on 24 February 1918. The document stated a number of principles such as freedom of expression, religion, assembly and association. These principles were further elaborated in the Provisional Constitution of 1919 and the first Constitution of 1920. Popular sovereignty was to be the basis of Estonia. Also, the second, presidential Constitution was based on popular sovereignty. Later the Constitution of 1938 was an attempt to return to democratic rule, but it still accorded powers to the president. Overall, in spite of internal political changes, Estonia was a legal, internationally recognized state in the years prior to 1940. This independence was interrupted in June 1940, in the aftermath of the Molotov–Ribbentrop Pact between Nazi Germany and the Soviet Union of August 1939. The Soviet Union used a similar pattern with all three Baltic states, beginning with ultimatums on the basis of alleged failures to fulfill mutual assistance pacts signed the previous year. The ultimatums had to be obeyed within hours, and soon after the Soviet troops marched into the capitals. The Soviets proposed and approved their new governments. Now, the new local governments seemingly made decisions which led to the annexation. In order to create an image of legitimacy, new elections were imposed under the presence of Soviet troops. The United States, along with a number of other states, did not recognise the occupation and annexation of the Baltic states. Latvia Latvia adopted the Declaration Establishing a Provisional Government of Latvia on 18 November 1918. In 1920, the freely elected Constitutional Assembly adopted two basic laws. The Satversme was adopted in 1922. However, Prime Minister Kārlis Ulmanis took power by a coup d'état and the parliament was dissolved in 1934. Lithuania After a century of foreign domination the Council of Lithuania adopted the Act of Independence of Lithuania on 16 February 1918. During the first decades of the Republic of Lithuania, three Constitutions were adopted in 1922, in 1928 and in 1938. The legislative institution of Lithuania was the freely elected parliament. However, Antanas Smetona took power by a coup d'état in 1926. He adopted the Constitution of 1928 which increased presidential power and reduced