Russia

The United States of the Ionian Islands was constituted as a federation, succeeding the Septinsular Republic and covering the islands plus the port of Parga.

Corfu became the seat of the British Lord High Commissioner, serving as the central hub for the new protectorate's administration.

Britain secured a protectorate over the Ionian Islands through a treaty signed in Paris on 5 November 1815, establishing the United States of the Ionian Islands.

Britain, France, and Russia agreed to create an autonomous Greek state under Ottoman suzerainty, limited to the Morea and Cyclades.

France, Russia, and Great Britain signed the London Protocol on 3 February 1830, recognizing Greece as a fully sovereign and independent state separate from the Ottoman Empire.

The protocol defined the northern border of Greece from the mouth of the Achelous or Aspropotamos river to the mouth of the Spercheios river.

The London Protocol determined that the Greek state would be a monarchy, ruled by the Ruler Sovereign of Greece.

Ambassadors from Russia, Britain, and France notified Greece and the Ottoman Empire of the protocol on 27 March / 8 April 1830.

The treaty split the Province of Limburg into Belgian and Dutch parts, resolving territorial disputes arising from the 1830 revolution.

Belgium was granted the right of transit by rail or canal over Dutch territory as an outlet to the German Ruhr.

The Treaty of London was signed on 19 April 1839, formally recognizing Belgium's independence and establishing its neutrality under international guarantee.

Abadan Island, long subject to competing claims between Iran and the Ottomans, was ceded to Iran by Turkey in 1847.

The Second Treaty of Erzurum was signed on 31 May 1847, settling boundary disputes between the Ottoman Empire and Qajar Persia.

Britain declared war on Russia on 27 March 1854, following the rejection of an ultimatum to withdraw from the Danubian Principalities.

France declared war on Russia on 28 March 1854, completing the Anglo-French diplomatic sequence against Russian expansion.

An international commission met on 5 September 1860 to investigate the causes of the 1860 sectarian violence and recommend a new administrative system for Lebanon.

Britain gained administrative control of Cyprus through the Cyprus Convention of 4 June 1878, a secret agreement concluded before the Congress opened, whose outcomes were reflected in the treaty.

The Treaty of Berlin was signed on 13 July 1878, formally settling affairs in the East among the major powers and the Ottoman Empire.

The treaty recognized the independence of Serbia, Montenegro, and Romania, although they lost territory compared to the Treaty of San Stefano.

Austria-Hungary obtained the right to garrison the Bosnia Vilayet and the Sanjak of Novi Pazar.