Answer:
To gain stability and power.
Step-by-step explanation:
The Soviet Union did this way to establish its economy stronger and maintain its influence in the region because Soviet Union is a powerful country. Every country work for their own interest in order to gain stability and power in the region. For this purpose, they build ways to protect their own interest from the harm of other countries. In the same way the Soviet Union also wanted to protect its interest so it build various ways to protect its interest and get benefits from that interest.