The existence of different denominations and sects within Islam is a manifestation of religious and cultural diversity that does not necessarily entail conflict and hostility, any more than do the existence of different religions or ethnicities. In multiethnic and multi-faith Russia, both Christians and Muslims know this well.
However, recently in the Middle East and beyond, there has been an increase of inter- and intra-religious strife, escalating into a sharply violent phase. For example, conflicts are escalating between Christians (including Orthodox) and Muslims in the Middle East and on a wider scope, Shiites and Sunnis (behind which stand governments often pursuing not religious but geopolitical interests) and followers of different Sunni groups, which pose a direct threat not only to regions close to Russian borders, but also to Russia's internal peace.
