Saudi-led warplanes bombed Ansarullah positions, killing eight people. Aden was the last refuge of President Abedrabbo Mansour Hadi before he resigned and fled to Saudi Arabia in March and has been a key battleground ever since.
In neighboring Lahj province, Hadi loyalists attacked an Ansarullah gathering, killing 11, military sources said. They also attacked the Al-Anad air base, Yemen's largest. Eight resistance fighters and two Hadi loyalists were killed.
UN envoy Ismail Ould Cheikh Ahmed is due in Sanaa for talks with the resistance group of Ansarullah and their allies on his ceasefire plans. After talks in Riyadh with the exiled government, he expressed optimism that a humanitarian truce could be agreed.
The United Nations has declared Yemen a level three emergency, the highest on its scale. More than 21.1 million people - over 80 percent of Yemen's population - are in need of aid, with 13 million facing food shortages. More than 2,800 people have been killed in the impoverished Arabian Peninsula country since March, according to UN figures.
As it stands, with its praiseworthy courage and popularity, Ansarullah has turned itself into a formidable force and obstacle in the way of establishing an unfair regional order. The US, Israel and their Arab partners are free to hold "peace talks” without Ansarullah, but they are wrong to assume they can eliminate the resistance. Any doubters should ask Hamas and Hezbollah.