Could someone answer some history questions for me? About genocide and Armenia? and Rwanda?

4, The Christian Armenians were killed by the Muslim Turks, the Russian Army who had been protecting the unarmed Armenians were recalled, as a result of the Bolshevik Revolution. World War One, was some kind of a factor in the lack of intervention by the community of nations. US President Woodrow Wilson could not muster support for the Armenian cause.