What was the significance of the annexation of Eastern Siberia to Russia?

Eastern Siberia was annexed in the 17th century, initially the purpose of its development was to gain a foothold in new lands, build forts and cities, establish contacts with the Qing empire and Mongolia, and then furs became important, they were exported and brought good income to the treasury. In the 19th century, Eastern Siberia became a place of exile, for example, for the Decembrists, and then, in the 20th century, the region began to extract minerals, oil, gas and develop tourism on Lake Baikal.