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main southern separatist group said it had launched a military operation in "to cleanse it of terrorist organisations", a move that would strengthen the UAE-backed faction's control in the south.

Yemen has been split by a seven-year-old war pitting a fractious coalition led by Saudi Arabia against the Iran-aligned .

The Houthis largely hold the north and the internationally recognised government is based in the south.

Rivalries among Yemeni factions fighting the Houthis resurfaced recently as southern forces backed by the United Arab Emirates expand their reach, imperiling a new presidential council and further complicating international efforts to end the conflict.

The deployment of the separatist Southern Transitional Council (STC)Ìýin Abyan, expanding its presence there, follows gains in neighbouring Shabwa province by the UAE-backed Giants Brigade against rival factions including the Islah Party.

The STC, which has vied with the Saudi-backed government for control of the south, said in an infographic on Tuesday that its military campaign aimed to "cleanse Abyan of terrorist organisation", specifying Islamist Al-Qaeda militants, while further securing Aden and other southern governorates, as well as roads between southern governorates.

Abyan this year has seen several attacks on soldiers that authorities suspect were carried out by Al-Qaeda in the Arabian Peninsula, which used the war between the Houthis and the coalition to enhance its influence.

The Saudi-led coalition intervened in Yemen in March 2015 after the Houthis ousted the government from the capital, Sanaa, in late 2014.

The conflict has killed tens of thousands of people and pushed millions into hunger.

Both sides have been accused of committingÌýgraveÌýviolations by human rights groups.

Three of the deadliest ongoing wars in the Middle East might have seen a downscale in violence lately, but the impact of conflict has been devastating.

We take a look at how this is played out in three countries: Libya, Syria and Yemen 👇

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In April, the Political Leadership Council formed under Saudi auspices assumed the powers of the president-in-exile as RiyadhÌýsought to strengthen the anti-Houthi alliance amid intense international pressure to end the war.

Council head Rashad Al-Alimi on Monday issued a notice, seen by Reuters, to STC leader and council member Aidarous Al-Zubaidi saying all military operations should be halted until the implementation of a troop redeployment in the south stipulated under a power-sharing pact brokered by Riyadh in 2019.

Instability in the south complicates United Nations efforts for a permanent ceasefire to pave the way for political negotiations to end the war in .

A UN-mediated truce between the coalition and the Houthis has largely held since April.

(Reuters)