1907-8-31 Anglo-Russian Entente

31st August 1907: The Anglo-Russian Entente is signed, forming the Triple Entente > . 

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For much of the second-half of the nineteenth century Britain and Russia had been involved in a series of disputes over colonial acquisitions in Persia, Tibet and Afghanistan. By the start of the twentieth century, however, the increasing threat of the relatively-young German Empire saw the two great powers seek to settle what had become known as ‘The Great Game’.

Russia had already ended years of tension with France through the Franco-Russian Alliance of 1894. Meanwhile the Entente Cordiale of 1904 saw Britain and France settle a number of longstanding colonial disputes. Consequently the signing of the Anglo-Russian Entente on 31 August 1907 completed a series of agreements that loosely tied the three nations together.

The Entente itself consisted of three separate agreements which were bundled together for ratification. The first divided Iran into three zones, two of which were part of the British and Russian spheres of influence respectively while the third – which separated the other two – was neutral. In the second agreement the two nations agreed not to interfere in Tibet’s domestic affairs. The third agreed that Afghanistan was ‘outside Russia’s sphere of influence’ – effectively a recognition of British influence there.

The Anglo-French and Anglo-Russian Ententes did not formally make the signatories allies. Nevertheless the Triple Entente, as the network of agreements between the three powers became known, acted as a counterweight to the existing Triple Alliance between Germany, Austria-Hungary and Italy. These two huge power blocs played a prominent role in the outbreak of the First World War. 

https://en.wikipedia.org/wiki/Anglo-Russian_Convention 

https://history.blog.gov.uk/2017/08/31/anglo-russian-entente-1907/ .