Excerpts from Books and Wikipedia
"Over Greece the powers were even more divided. Russia, with all its dislike of revolutions, could not but benefit from the movement of an Orthodox people, which weakened the Turks and must rely largely on Russian help. (Moreover, she had a treaty right to intervene in Turkey in defence of Orthodox Christians.) Fear of unilateral Russian intervention, philhellene pressure, economic interests and the general conviction that the disintegration of Turkey could not be prevented, but could at best be organized, eventually led the British from hostility through neutrality to an informal pro-hellenic intervention. Greece thus (1829) won her independence through both Russian and British help." [Hobsbawm: Revolution, p. 104]