Answer: Africa
Notes: Russia recently signed a key nuclear agreement with Niger, strengthening its influence in the Sahel region of West Africa. The Sahel region is located in Africa, forming a 5,000-kilometre-long semi-arid belt. It stretches from the Atlantic Ocean in the west to the Red Sea in the east. It lies between the Sahara Desert in the north and the humid savannas in the south. It passes through African countries like Senegal, Mauritania, Mali, Burkina Faso, Niger, Nigeria, Chad, Sudan, and Eritrea.
