"The Treaty of Paris of 1856 settled the Crimean War between the Russian Empire and an alliance of the Ottoman Empire, the British Empire, the Second ...
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French Empire and the Kingdom of Sardinia.
The treaty, signed on 30 March 1856 at the Congress of Paris, made the Black Sea neutral territory, closed it to all warships and prohibited fortifications and the presence of armaments on its shores.
The treaty marked a severe setback to Russian influence in the region. Conditions for the return of Sevastopol and other towns and cities in the south of Crimea to Russia were clear, as it could not establish any naval or military arsenal on the coast of the Black Sea." - (en.wikipedia.org 14.03.2020)