Tartars are remnants of Great Mogols hordes who invaded and dominated Russia for a few centuries. At the end Russians subverted their culture and government structure making them kind a vulnerable and then militarily destroyed their urban centers. It become possible as soon as Russians fond a way to corrupt some of their aristocracy and Russians also had a firearm technology while Tartars still relied on bows. A lot of people initially welcomed Russian subversion as their lifestyles seemed to be an improvement over their spartan military-style islamist regime. By mid 16th century all the remaining Mogol Khanates were incorporated into Russia and their leadership were killed or forcefully baptized.
Tartars were calm for centuries but some closet revanchism emerged in earlier 1990s.
I think it is very important for Russians to contain it because Tartars are actually a huge minority just like African-Americans in US. They are present in every part of the country in huge numbers.
This presumes that peoples keep their identity for many centuries. The Tartars were a strategic enemy of Russia throughout the Middle Ages, but at the present time they are one Muslim minority among many, and are much easier to live with than North Caucasian Muslims. The “revanchism” of the 90s was simply asserting the ethnic identity free of Communist lies; every people in the Russian Federation did that, yet only in Chechnya rebirth of ethnic and religious institutions lead to war.