Russia did not lose a lot in terms of territory but it was humbled by the Paris Treaty. Apart from the loss of its Black Sea Fleet and Bessarabia, it lost prestige in the Balkans and forfeited the gains that it had made in the Eastern Question since the eighteenth century. Russia did not recover the dominant position it had held in Europe until after 1945.
Bold statement, although I guess it did not decide on world's event on its own between 1856 and 1945. And that was probably the case between 1815-1853 and 1945-1991
