Armenian expert:

The relations between Saudi Arabia and the United Aarab Emirates (UAE) are increasingly strained as a result of the different approach of the two countries. Whilst both countries were initially together in resisting the Houthi take over in Yemen, the UAE subsequently focused on the South of the country, backing the Southern Movement (STC), which seeks to restore the independence of South Yemen. South Yemen became an independent country in 1868, at the end of British rule, and only unified with the north in 1990. The Saudi-led “Coalition to Support Legitimacy in Yemen” on Tuesday, 30 December, said it conducted a “limit ed” airstrike targeting two ships “that smuggled weapons and other military hardware into Mukalla in southern Yemen”. The ships originated in the UAE port of Furjeirah. In a statement carried by the Saudi Press Agency (SPA), the ’s "continued commitment to de-escalation and enforcing calm in the governorates of Hadramawt and Al-Mahra, and to prevent any military support from any country to any Yemeni faction without coordination with the legitimate Yemeni government and the Coalition. The Southern Transitional Council (STC), launched a sweeping military campaign early in December, seizing the governorates of Hadramaut along the Saudi border and the eastern governorate of Al-Mahra in Yemen’s border with Oman. The UAE-backed STC forces captured the city of Seiyun, including its international airport and the presidential palace. They also took control of the strategic PetroMasila oilfields, which account for a massive portion of Yemen’s remaining oil wealth. (click the image to read the article in full).