Despite some optimism for new talks, antagonists in Yemen’s five-year-old war have basically ignored a Saudi-led unilateral cease-fire announced a week ago, United Nations officials said Thursday, warning that relief money for Yemen is running out just as the coronavirus has invaded.

“Yemen cannot face two fronts at the same time: a war and a pandemic,” Martin Griffiths, the special United Nations envoy for Yemen, told the Security Council in a videoconference briefing shown on the United Nations website.

Mark Lowcock, the United Nations humanitarian relief coordinator, told the Council that 31 of its 41 programs that help Yemen’s 30 million people may have to shut down in a few weeks for lack of money.

The officials spoke one week after a Saudi-led coalition that has been fighting the Houthi rebels in Yemen since 2015 announced that it was halting military attacks for two weeks. The Saudis said they hoped the pause would lead to a truce, peace talks and an opportunity to prevent the coronavirus from overwhelming Yemen, the Arab world’s poorest country.