MBZ's brother Mansour hosted in Riyadh by the Saudi defense minister.
Two Boeing planes of UAE officials followed to coordinate on Yemen.
The UAE withdrew from Yemen earlier this year after Saudi Arabia bombed its weapons shipments to southern allies.
Now Riyadh needs Abu Dhabi's leverage over Yemen's most effective anti-Houthi forces (Giants Brigade, STC, Tarik Saleh's NRF).
UAE wants space for the STC and wants Islah party banned.
Analysts say the UAE may also seek Saudi concessions on Sudan (where they back opposing sides) and Somaliland (which Saudi Arabia condemned Israel for recognizing while the UAE has a military base there).
An analyst: The Emiratis know the Saudis are in a worrisome position and they are coming in on a white horse.
Source: MEE