A summer palace in Siberia

At http://siberiantimes.com/science/casestudy/features/f0009-who-built-this… …. we lean that a palace complex on an island in a lake in southern Siberia dates back 1300 years. Known as Por-Bajin it was constructed around 757AD on a high altitude lake in Tura. It seems to go back to the Uigur Khaganate (AD745-820)  who were nomads. Another puzzle is that it resembles Chinese architecture – yet is many hundreds of miles from the Chinese. It is situated on a lake near the border between Russia and Mongolia, to the north of the Altai Mountains.