Question: The Austro-Hungarian U-boat fleet during the First World War, mainly consisted of German manufactured units transported by rail from Germany's northern shipyards to the Austrian ports on the Adriatic Sea, following the end of the war in 1918, all Austrian submarines were surrendered to the powers of which understanding, linking the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland after the signing of the Anglo-Russian Entente on 31 August 1907, is called?

Context paragraphs:
List of Austro-Hungarian U-boats: The Austro-Hungarian U-boat fleet during the First World War mainly consisted of German manufactured units transported by rail from Germany's northern shipyards to the Austrian ports on the Adriatic Sea.  They served throughout the war against Italian, French and British shipping in the Mediterranean Sea with some success, losing eight of the twenty eight boats in service in return.  Following the end of the war in 1918, all Austrian submarines were surrendered to the Entente powers, who disposed of them individually.  As both Austria and Hungary became landlocked in the aftermath of the war, no Austrian or Hungarian submarines (or any other naval vessels) have been commissioned since.

Otranto Barrage: The Otranto Barrage was an Allied naval blockade of the Otranto Straits between Brindisi in Italy and Corfu on the Greek side of the Adriatic Sea in the First World War.  The blockade was intended to prevent the Austro-Hungarian Navy from escaping into the Mediterranean and threatening Allied operations there.  The blockade, or rather the fleet capital ships in support of it, was effective in preventing surface ships from escaping the Adriatic, but it had little or no effect on the submarines based at Cattaro.

U-43-class submarine (Austria-Hungary): The "U-43" class was a class of two coastal submarines or U-boats operated by the Austro-Hungarian Navy (German: "Kaiserliche und Königliche Kriegsmarine "or" K.u.K. Kriegsmarine" ) during World War I.  The two submarines that comprised the class were Type UB II submarines of the Imperial German Navy, making the two classes identical.  From the beginning of World War I, Austria-Hungary had been working to increase the size of its U-boat fleet, so the Imperial German Navy, which was finding it difficult to obtain trained submarine crews, sold two of its UB II boats, "UB-43" and "UB-47" , to its ally in June 1917.

Treaty of London (1915): London Pact (Italian: "Patto di Londra" ), or more correctly, the Treaty of London, 1915, was a secret pact between the Triple Entente and the Kingdom of Italy.  The treaty was signed in London on 26 April 1915 by the United Kingdom of Great Britain and Ireland, the French Third Republic, the Russian Empire, and the Kingdom of Italy.  Its intent was to gain the alliance of Italy against its former allies, including German empire and Austro-Hungary.  The main lure was promising large swaths of Austria-Hungary to the north of Italy and to the east across the Adriatic.  Britain also promised funding.  Italy promised to enter the war the next month.  The Allies could easily outbid Austria-Hungary and thereby won a military alliance with 36 million Italians.  The secret provisions were published by the Bolsheviks when they came to power in Russia in late 1917.

Austro-Hungarian U-boat classes: The Austro-Hungarian U-boat fleet during the First World War mainly consisted of German manufactured units transported by rail from Germany's northern shipyards to the Austrian ports on the Adriatic Sea.  They served throughout the war against Italian, French and British shipping in the Mediterranean Sea with some success, losing eight of the twenty eight boats in service in return.  Following the end of the war in 1918, all Austrian submarines were surrendered to the Entente powers, who disposed of them individually.  As both Austria and Hungary became landlocked in the aftermath of the war, no Austrian or Hungarian submarines (or any other naval vessels) have been commissioned since.

Triple Entente: The Triple Entente (from French "entente" ] "friendship, understanding, agreement") was the understanding linking the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland after the signing of the Anglo-Russian Entente on 31 August 1907.  The understanding between the three powers, supplemented by agreements with Japan and Portugal, constituted a powerful counterweight to the Triple Alliance of Germany, Austria-Hungary and the Kingdom of Italy, though Italy did not side with Germany and Austria during World War I and joined the Entente Powers instead, in the 1915 Treaty of London.

Ireland and World War I: During World War I (1914–1918), Ireland was part of the United Kingdom of Great Britain and Ireland, which entered the war in August 1914 as one of the Entente Powers, along with France and the Russian Empire.  In part as an effect of chain ganging, the UK decided due to geopolitical power issues to declare war on the Central Powers, consisting of the German Empire, the Austrian-Hungarian Empire, the Ottoman Empire, and the Kingdom of Bulgaria.

History of the United Kingdom during World War I: The United Kingdom of Great Britain and Ireland was one of the Allied Powers during the First World War of 1914–1918, fighting against the Central Powers (the German Empire, the Austro-Hungarian Empire, the Ottoman Empire and the Kingdom of Bulgaria).  The state's armed forces were reorganised—the war marked the creation of the Royal Air Force, for example—and increased in size because of the introduction, in January 1916, of conscription for the first time in the kingdom's history as well as the raising of what was, at the time, the largest all-volunteer army in history, known as Kitchener's Army, of more than two million men.  The outbreak of war has generally been regarded as a socially unifying event, although this view has been challenged by more recent scholarship.  In any case, responses in Great Britain in 1914 were similar to those amongst populations across Europe.

Entente Cordiale: The Entente Cordiale (] ) was a series of agreements signed on 8 April 1904 between the United Kingdom of Great Britain and Ireland and the French Third Republic which saw a significant improvement in Anglo-French relations.  Beyond the immediate concerns of colonial expansion addressed by the agreement, the signing of the Entente Cordiale marked the end of almost a hundred years of intermittent conflict between the two states and their predecessors, and replaced the "modus vivendi" that had existed since the end of the Napoleonic Wars in 1815 with a more formal agreement.  The Entente Cordiale was the culmination of the policy of Théophile Delcassé, France's foreign minister from 1898, who believed that a Franco-British understanding would give France some security against any German system of alliances in Western Europe.  Credit for the success of the negotiation belongs chiefly to Paul Cambon, France's ambassador in London, and to the British foreign secretary Lord Lansdowne.

Eight-Nation Alliance: The Eight-Nation Alliance was an international military coalition set up in response to the Boxer Rebellion in the Qing Empire of China.  The eight nations were the Empire of Japan, the Russian Empire, the British Empire, the French Third Republic, the United States, the German Empire, the Kingdom of Italy and the Austro-Hungarian Empire.  In the summer of 1900, when the extra-jurisdictional international legations in Beijing came under attack by Boxer rebels supported by the Qing government, the coalition dispatched their armed forces, in the name of "humanitarian intervention", to defend their respective nations' citizens, as well as a number of Chinese Christians who had taken shelter in the legations.  The incident ended with a coalition victory and the signing of the Boxer Protocol.

Supporting paragraphs: Austro-Hungarian U-boat classes Triple Entente
Answer: Triple Entente