During the middle ages and the early modern period various individual Christian rulers found it necessary or convenient to ally with Muslim rulers, but such alliances met with the firm disapproval of western European Christians in general. In the nineteenth century the states of western Europe were very anxious to prop up the declining Ottoman Empire in the Balkans in order to prevent Russian expansion. They did not trust the nationalist movements in the Balkans to resist Russian imperialist plans. So they supported the Muslim Ottomans against the Orthodox Christian Russians.
More recently, NATO supported the Muslims in Kosovo against the Orthodox Christian Serbs.

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