At least 10,000 people have been killed in nearly two years of war between a Saudi-led Arab coalition and the Yemeni Houthi movement. Already desperately poor even before the war, Yemen is now in the throes of a major humanitarian crisis.
"We know today that a solution is close because we know it. We know that a solution in Yemen will be based on a military and political aspect so it's a bit of a shame that the parties don't want to sit down at the table to discuss that," UN envoy Ismail Ould Cheikh Ahmed told reporters after talks in Paris with French Foreign Minister Jean-Marc Ayrault.
"One of the subjects that concerns us the fact that we're seeing an increase in military operations with the consequences which that is having on the civilian population," Ahmed said.
Saudi Arabia intervened in Yemen's civil war in 2015 to back fugitive resigned president Abd-Rabbu Mansour Hadi.
The Houthis control most of Yemen's population centers in the northwest, including Sana'a.
Some 7.3 million Yemenis are now classed by the UN as "severely food insecure", while there has been an upsurge in civilian casualties as bombing and fighting intensify.
"This is a conflict that is less talked about than others, but it can't be forgotten because the humanitarian consequences on the ground are catastrophic," said France's Ayrault, Reuters reported.