What was the reason for the Nazis to support certain ethnic minorities over the majority populations in the conquered territories?
For example, they supported Crimean Tatars against the majority of Russians in Crimea, Ukrainians and "mountainers" in Poland against Poles as well as Ruthenians in Carpathian Ukraine against Ukrainians. They also consistently supported various Turkic and Mongolic minorities against the Slavs.
Sometimes they supported totally scanty or improvised ethnic groups against numbered and established peoples.
What was the reason for such policy? Did not it harm the attitude towards the Nazis among the conquered population?
On some instances some ethic groups such as Karaites cited the laws of Russian Empire to receive privileges. Indeed, in late Russian Empire only Jews had deminished rights compared to Russians while most of Turkic, Mongolic native North peoples as well as Cossacks enjoyed privileges over Russians.
Was not the Imperial Russian law in essence the source of the Nazi ethic policies? Is there a connection? Or was it more a case of "the enemy of my enemy is my friend?"