A monument to the victory of Rus' over the Kazan Khanate is...

• The Cathedral of Vasily the Blessed on Red Square
• The Church of the Ascension in Kolomenskoye, Moscow

The question asks to identify the monument that commemorates the victory of Rus' over the Kazan Khanate. Among the options provided, the Cathedral of Vasily the Blessed on Red Square is historically associated with this victory.

Answer: The Cathedral of Vasily the Blessed on Red Square