Yemeni Government, Separatists Sign Deal To End Power Struggle

The transcript discusses a deal aimed at resolving a power struggle in Yemen. The Southern Transitional Council (STC) and Yemeni President Hadi signed an agreement in Saudi Arabia, which was broadcast live. The deal includes the STC in a new government and places its armed forces under government control. Both parties are part of a coalition that intervened in Yemen in 2015. The relationship soured when UAE-backed separatists seized Aden. Saudi Crown Prince Mohammed bin Salman expressed hope that the agreement would help end the four-year civil war.

What event led to the souring of the relationship between President Hadi's government and the UAE-backed separatists?

What is the hope expressed by Saudi Crown Prince Mohammed bin Salman regarding the agreement?