Meanwhile on Thursday, thousands of separatist supporters rallied in support of the UAE in Aden, many of them waving colorful UAE flags.
Rights groups and activists accuse the UAE and the Saudi-led military coalition of gross human rights violations in Yemen, including airstrikes on homes, schools and hospitals.
Clashes between UAE-backed separatists and government forces - who for years fought on the same side against the Iran-aligned Houthi rebels - have raised fears that the Yemen could break apart entirely.
The Saudi-led coalition first intervened in Yemen in March 2015 as the Houthi rebels closed in on Aden prompting Hadi to flee into Saudi exile.
The conflict has since killed tens of thousands of people - most of them civilians - and driven millions more to the brink of famine in what the United Nations calls the world's worst humanitarian crisis.