I found it interesting to learn about Tatarstan from the Wikipedia article.

Russia: History Template‑class

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However i cannot understand the following passage in the history section which seems ungrammatical and incomplete:

"By Tatarstan Constitution president could be elected only by people of Tatarstan, but due to Russian federal law this law was stopped fo indefinite term. The Russian law about election of governors says, that they should be elected by local parliaments and that the candidate could be presented only by president."

Hope this helps in some way.

Zalky