Post-Soviet conflicts across the former USSR followed Orthodox-Muslim civilizational fault lines.

Evidence

Meanwhile in the former Soviet Union, Orthodox Belarus, Moldova, and Ukraine gravitate toward Russia, and Armenians and Azeris fight each other while their Russian and Turkish kin attempt both to support them and to contain the conflict. The Russian army fights Muslim fundamentalists in Tajikistan and Muslim nationalists in Chechnya. — Samuel P. Huntington, The Clash of Civilizations and the…, 337