Of the five Central Asian countries, why is Kazakhstan so big?

Among the five Central Asian countries, why Kazakhstan has such a large territory is actually a conspiracy. In the Soviet Union, the population was very good but miserable, mainly Serbs. It was originally Serbian territory, but it was Islamized and eventually killed and became independent, so it was very stable. Kazakhs are mainly Russians. Therefore, Halac Stein is equivalent to the Russian back garden.

This is actually related to a conspiracy in the Soviet Union at that time. Central Asia was dominated by Kazakhs in modern times, and a powerful Kazakh khanate was established. This Kazakh khanate is brave and tenacious, which made Russia pay a heavy price in the process of conquering Kazakhstan. In fact, the reason is not that simple, there is also a conspiracy.

We can see that the whole Central Asia covers an area of about 4 million square kilometers, of which Kazakhstan accounts for 272 square kilometers, twice the sum of the other four countries. In essence, the division of national territory should be relatively balanced, especially in the Soviet Union, such as Eastern Europe and Caucasus, where there is little difference between countries, so as to check and balance each other and maintain stability. But why is Kazakhstan the only country in Central Asia?

Half of Kazakhstan is Russian, so Nazarbayev decided to move the capital to Astana. In a short period of 20 years, the number of Russians has dropped from half to the present 1/4, and Turkmen are dominant. After the disintegration of the Soviet Union, Kazakhstan was very obedient to Russia. So among the five Central Asian countries, Kazakhstan's territory is so large that it is actually a conspiracy of the Soviet Union?