Yemen's war shows no signs of abating a week after the Saudi-led military coalition declared a unilateral truce because of the coronavirus threat looming over the war-devastated nation.

Yemen announced its first case of the COVID-19 respiratory disease last Friday, as aid organisations warned the country's health system, which has all but collapsed since the conflict broke out in 2014, is ill-equipped to handle the crisis.

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The coalition supporting the government against the Iran-aligned Houthi rebels said the two-week ceasefire was designed to head off the pandemic, a move welcomed by the United Nations but dismissed by the Houthis as political manoeuvring.

Has a ceasefire been agreed?

Despite Saudi Arabia's announcement of a halt in military activities from April 9, fighting on the ground and coalition air attacks continue.

"We don't have a ceasefire agreement that all of the major players have signed up to yet," said Peter Salisbury, an analyst at the International Crisis Group.

The United Nations special envoy for Yemen, Martin Griffiths, said on Friday he sent revised proposals to both sides to secure a nationwide ceasefire and the "urgent resumption" of political dialogue.

The confirmation of Yemen's first coronavirus case "makes it even more imperative to stop the fighting immediately", he said.

What do the Houthis want?

The rebels are negotiating from a strong position after recent military gains as they advance towards the government's last northern stronghold of Marib, an oil-rich region that would be a major strategic prize.

Hours before the Saudi-led coalition's truce announcement, the Houthis released a document with a long list of demands, including the withdrawal of foreign troops and the end of the coalition's blockade on Yemen's land, sea and air ports of entry.

"The Houthis see a ceasefire as more than just a halt to military activities," Salisbury said.

The rebels also demanded the coalition pay government salaries for the next 10 years, and hand over compensation for rebuilding, including homes destroyed in air attacks.

"Saudi Arabia may want out of the Yemen war and is certainly prepared to pay for a lot of reconstruction, but they are not likely to sign an agreement that calls for their total capitulation," said Elana DeLozier, a fellow at the Washington Institute for Near East Policy.

Why is Riyadh offering an olive branch?

The ceasefire announcement comes at a sensitive time for Saudi Arabia, which is reeling from plunging oil prices and grappling with a serious coronavirus outbreak of its own.

It has for some months indicated it is seeking to extricate itself from the costly conflict that has killed tens of thousands of Yemeni people and triggered what the UN calls the world's worst humanitarian crisis.

"Saudi Arabia increasingly wants to end the war in Yemen," DeLozier said. "Their priorities are shifting and the war in Yemen is expensive and militarily unwinnable."

Analysts say pressure on the Saudis to reduce civilian casualties in air attacks, a withdrawal by their coalition partner the United Arab Emirates in mid-2019, together with rifts within the government camp, have weakened the coalition and strengthened the rebels' resolve.

"The coronavirus threat provided a face-saving way to announce a ceasefire without seeming to give in to the Houthis," DeLozier said.

What does this mean for Yemenis?

"We in Yemen don't want an announcement of a ceasefire, we want an actual ceasefire on the ground," said Abdulhaq al-Amiri, a 35-year-old resident of Sanaa.

An estimated 24 million Yemenis - more than 80 percent of the population - depend on some form of humanitarian or protection assistance for survival, according to the UN.

More than three million people are displaced, many in camps particularly vulnerable to disease.

Bashir al-Fadli, a 28-year-old from Sanaa, said neither the coalition nor the rebels have the Yemeni people's interest at heart.

"We are sick and tired of war ... and the only loser is the Yemeni citizen with no salary, no water, no electricity, no education - yet both sides don't care," he said.

For Amjad Ali, 28, coronavirus is just another issue Yemenis will have to deal with.

"The whole world is scared of the coronavirus, except for Yemen. We here have become accustomed to death."