I may agree with the above stated. It may be a violation of a heritage structure and my first impression was negative. But when I saw that I had to change my opinion. There are some remnants of Tatar Khan graveyards close to Siusiumbike (so we can treat that as continuity of Tatar reign) but I would treat the mosque as underlining new tendencies of Tatar Republic. The mosque is built in the style of modern Central Asia mosques but as a whole it not violating the whole structure. In fact it is the most fascinating part of the whole Kremlin.