From 1920 to 1945, Estonia's border with Russia, set by the 1920 Tartu Peace Treaty, extended beyond the Narva River in the northeast and beyond the town of Petseri in the southeast.

Voluntary activists arranged expeditions to Karelia ( heimosodat ), which ended when Finland and the Soviet Union signed the Treaty of Tartu in 1920.

* 1920 – The Tartu Peace Treaty is signed between Estonia and Russia.

* Anniversary of Treaty of Tartu ( Estonia )

According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted.

On 2 February 1920, the Tartu Peace Treaty was signed with Soviet Russia, wherein Russia acknowledged the independence of the Estonian Republic.

February 2: Treaty of Tartu ( Russian – Estonian ) | Tartu Peace Treaty

** Estonian War of Independence: The Tartu Peace Treaty is signed, ending the war and recognizing Estonian independence.

The Estonian War of Independence ensued on two fronts between the newly proclaimed state and Bolshevist Russia to the east and the Baltic German forces ( the Baltische Landeswehr ) to the south, resulting in the Tartu Peace Treaty recognising Estonian independence in perpetuity.

2 February – Anniversary of the Tartu Peace Treaty ( Tartu rahulepingu aastapäev )

After the Treaty of Tartu the area of Petsamo was ceded to Finland, and Sør-Varanger ( and Norway ) no longer bordered Russia, until Finland had to cede it back to the Soviet Union in 1944.

A considerable part of the remaining area populated by Ingrian Finns seceded from Bolshevist Russia as the Finland-backed Republic of North Ingria, but was reintegrated with Russia in the end of 1920 according to the conditions of the Treaty of Tartu.

About 1000 Ingrians lived in the area ceded to Estonia under the Peace Treaty of Tartu ( 1920 ).

Under the Russian-Estonian Peace Treaty of Tartu of 1920, a small part of West Ingria became part of the Republic of Estonia.

With the Russian-Finnish Peace Treaty of Tartu it was re-integrated into Russia, but enjoyed a certain degree of autonomy.

After 1991 there have also been some disputes about the Estonian-Russian border in the Narva area, as the new constitution of Estonia ( adopted in 1992 ) recognizes the 1920 Treaty of Tartu border to be currently legal.

* Treaty of Tartu

The area was given to Finland as a result of the Treaty of Tartu and renamed Petsamo.

With the Treaty of Tartu, Finland had to return some of the equipment they had operated earlier.

According to the Treaty of Tartu, the Russian-Estonian state boundary went eastwards of Izborsk and thus the town was part of Estonia from 1920 to early 1945 when, both Russia and Estonia being part of Soviet Union, the Russian SFSR / Estonian SSR boundary was moved westwards and thus Izborsk became part of the Russian SFSR.

Furthermore, before the Treaty of Tartu in 1921, the border area was restless.

* 1920 – The Latvian – Soviet Peace Treaty, which relinquished Russia's authority and pretenses to Latvia, is signed, ending the Latvian War of Independence.

* 1920 – World War I: Ottoman sultan Mehmed VI's representatives sign the Treaty of Sèvres that divides up the Ottoman Empire between the Allies.

Following World War I, the 1920 Treaty of Sèvres demilitarized the strait and made it an international territory under the control of the League of Nations.

* 1920 – Following more than a month of Turkish-Armenian War, the Turkish dictated Treaty of Alexandropol is concluded.

* 1920 – Under the terms of the Svalbard Treaty, international diplomacy recognizes Norwegian sovereignty over Arctic archipelago Svalbard, and designates it as demilitarized.

Similarly, it was presented to various government officials, military and diplomatic, in the United States and in Europe ( 1919 – 1920 ), in opposition to the Russian Revolution, and to influence the terms of the peace settlement which resulted in the Treaty of Versailles.

Hungary's modern borders were first established after World War I when, by the terms of the Treaty of Trianon in 1920, it lost more than 71 % of what had formerly been the Kingdom of Hungary, 58. 5 % of its population, and 32 % of the Hungarians.

In no small measure through the diplomatic efforts of Venizelos, Greece secured Western Thrace in the Treaty of Neuilly in November 1919 and Eastern Thrace and a zone around Smyrna in western Anatolia ( already under Greek administration since May 1919 ) in the Treaty of Sèvres of August 1920.

In 1920, by signing the Treaty of Trianon, Hungary lost 71 % of its territory, and along with these, 33 % of the ethnic Hungarian population.

* 1920 – The Soviet – Lithuanian Peace Treaty is signed.

* 1920 – The Treaty of Versailles takes effect, officially ending World War I.

After the defeat of Germany, the service was dissolved completely on 8 May 1920 under the conditions of the Treaty of Versailles, which mandated the destruction of all its aircraft.

The League held its first council meeting in Paris on 16 January 1920, six days after the Versailles Treaty came into force.

Ottoman territorial claims were first addressed in the Treaty of Sèvres ( 1920 ) and finalized in the Treaty of Lausanne ( 1923 ).

The Treaty of Versailles ( 1920 ) provisionally recognized the former Ottoman communities as independent nations.

* 1920 – Treaty of Moscow: Soviet Russia recognizes the independence of the Democratic Republic of Georgia only to invade the country six months later.

* 1920 – The United States Senate rejects the Treaty of Versailles for the second time ( the first time was on November 19, 1919 ).

* 1920 – Italy and the Kingdom of Serbs, Croats and Slovenes sign the Treaty of Rapallo.

After the Paris Peace Treaty of 1947, Finland succeeded in retaining democracy and parliamentarism, despite the heavy political pressure on Finland's foreign and internal affairs by the Soviet Union.

In the Treaty of Versailles ( 1919 ) the winners imposed relatively hard conditions on Germany and recognised the new states ( such as Poland, Czechoslovakia, Hungary, Austria, Yugoslavia, Finland, Estonia, Latvia, Lithuania ) created in central Europe from the defunct German, Austro-Hungarian and Russian empires, supposedly out of national self-determination.

After the Winter War ( 1939 – 1940 ) according to the Moscow Peace Treaty, Ladoga, previously shared with Finland, became an internal basin of the Soviet Union.

* 1918 – Germany, Austria and Russia sign the Treaty of Brest-Litovsk ending Russia's involvement in World War I, and leading to the independence of Finland, Estonia, Latvia, Lithuania and Poland.

The 34 State Parties to the Open Skies Treaty are: Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Canada, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Norway, Poland, Portugal, Romania, Russian Federation, Slovak Republic, Slovenia, Spain, Sweden, Turkey, Ukraine, United Kingdom, and United States.

The territory to become Finland is ceded to Russia by the Treaty of Fredrikshamn.

The Treaty of Brest-Litovsk in March 1918 led to Russia's exit from the war and the independence of Armenia, Finland, Estonia, Latvia, Ukraine, Lithuania, Georgia and Poland.

The territory to become the Grand Principality of Finland is ceded to Russia by the Treaty of Fredrikshamn.

On the 7 August 1743 ( the Treaty of Åbo ), Sweden ceded to Russia all the southern part of Finland east of the river Kymmene, which subsequently became the boundary between the two states.

After the Finnish War, which ended when Sweden ceded Finland to Imperial Russia at the Treaty of Fredrikshamn in 1809, Turku became briefly the official capital, but soon lost the status to Helsinki, as Emperor Alexander I felt that Turku was too far from Russia and too aligned with Sweden to serve as the capital of the Grand Duchy of Finland.

After the conquest of Finland by Russian armies in 1808 Sweden had to cede Finland to Russia in 1809 ( the Treaty of Fredrikshamn ).

The European Ombudsman was established by the Maastricht Treaty and the first, Jacob Söderman of Finland, was elected by Parliament in 1995.

By the Treaty of Fredrikshamn in 1809 Finland was ceded from Sweden and became an autonomous grand duchy within the Russian Empire.

* 1809: Treaty of Fredrikshamn: Finland becomes part of Russia.

Up until the Finnish War 1808-1809 and the Treaty of Fredrikshamn the province of Västerbotten also included a small part of today's Finland.

The border of the Moscow Peace Treaty ( 1940 ) was recognized by Finland again in the Peace of Paris, 1947.

When the Baltic Fleet was approaching Umeå, news came that the Treaty of Åbo () had been finalized, with Sweden ceding to Russia the towns of Lappeenranta and Hamina and a strip of Finland to the northwest of Saint Petersburg.

The loss of Finland to Russia in the Finnish War, settled in the Treaty of Fredrikshamn, provided momentum for the Swedish nobility and other forces to depose the king and restore political power to parliament.

By the Treaty of Stolbovo on February 27, 1617 the tsar surrendered to the Swedish king the provinces of County of Kexholm and Ingria, including the fortress of Nöteborg ( later Schlusselburg ), the key to Finland.

By the Treaty of Åbo 7 May 1743 the terms of the empress were accepted and only that small part of Finland which lay beyond the Kymi River was retained by Russia.