U.S. President Barack Obama has begun key talks in Ethiopia on his second leg of his African tour. The talks between Obama and Ethiopia's Prime Minister Hailemariam Desalegn will focus on economic ties and regional security issues, as well as the civil war in South Sudan. Obama is the first serving U.S. President to visit Ethiopia. Obama flew to Ethiopia after a three day visit to Kenya. Obama is also expected to address the African Union at it's headquarters on Tuesday in Addis Ababa.