The Constitution of the Russian Federation (Clause 3, Article 44).
Federal Law of June 25, 2002 N 73-Ф3 "On Objects of Cultural Heritage of the Peoples of the Russian Federation"
"В лето 7093-го приидоша с Руси воеводы Василей Сукин да Иван Мясной, с ними же многия руския люди. Поставиша ж град Тюмень, иже преже бысть град Чингий, и поставиша домы себе, воздвигоша же церкви в прибежище себе и прочим православным християном".(In the summer of 7093, governors Sukin and Myasnoy came from Russia with a large number of people. they have founded Tyumen, which they called the Chingy, have built churches for themselves and the other Christians.)