Ukrainian and Russian officials will meet next Sunday in Abu Dhabi for a new round of peace talks, U.S. officials said Saturday, after two days of meetings in the city this week failed to produce concrete results.

This week’s meetings, the first time all three countries sat face-to-face for talks to try and hash out a ceasefire, touched on economic and military issues, as well as disputes over how much Ukrainian territory Russia will continue to hold after the war, said two U.S. officials. Both spoke on the condition of anonymity to discuss sensitive diplomatic issues.

It’s not clear at this point who from the three governments will be involved in next week’s talks.

Hours after the talks broke for the day on Friday, Russia launched its largest aerial assault on Ukraine so far this year, killing civilians and plunging much of the country into darkness during an overnight attack.

Attacks on civilian targets and infrastructure have been a hallmark of the Russian reaction to months of talks. They have intensified in recent weeks as Ukraine faces one of its coldest winters in years.

“These talks were about deescalation,” one of the U.S. officials said. Despite the continued Russian attacks — and two unprovoked invasions by Russian forces into Ukraine in 2014 and 2022 — the official said: “President Putin said unequivocally that he wants to see a diplomatic settlement of this deal … and, you know, we want to take him at his word.”

The meetings in Abu Dhabi were led by Trump’s special envoy Steve Witkoff and his son-in-law Jared Kushner, who met in Switzerland with Ukrainian President Volodymyr Zelenskyy last week before heading to Moscow to huddle with Russian President Vladimir Putin. They capped the week with meetings with both sides, where they were joined by Army Secretary Dan Driscoll and the head of the European Command and NATO forces, Gen. Alexus Grynkewich.

One of the big sticking points in the negotiations has been Western security guarantees for Ukraine in any post-war scenario. European countries have pushed for a small troop presence in Ukraine to monitor a ceasefire, with France and Germany leading the push to send troops.

President Donald Trump has said the U.S. won’t put boots on the ground in Ukraine but will help. Defense officials have said that American commitment would likely involve satellite and intelligence support, some drone flights to monitor the line of separation, and logistics support.

A second U.S. official on Saturday appeared to dismiss those early European commitments, noting it is the American security guarantee that is most critical: “The Coalition of the Willing efforts are nice. They had a couple helicopters and a couple troops and a couple guarantees here and there, but if you speak to the Ukrainians, it’s really the American security guarantees that matter.”

The U.S. officials said a big part of this week’s talks focused on economics, as well as who controls Ukraine’s Zaporizhzhia nuclear power plant, which is being occupied by Russian forces. There was no agreement, but the push — favored by Moscow — is for Ukraine and Russia to share the electric output from that plant, which is the largest in Europe.

“Both parties are starting to envision what they can gain from peace, like the prosperity plan for Ukraine, some of these opportunities for Russia to do business deals with the United States of America,” the second official said.

“There’s obviously not a lot of trust right now between Europe and Russia, but we want to create a framework where that can start a new paradigm that can start building trust by showing real de-escalation.”

Heading into the talks Witkoff said only one issue — which Zelenskyy later said was territory — was left to be resolved. Russia has demanded it take all of Ukraine’s eastern Donbas region, even parts Ukraine still controls. Ukraine has resisted the demand, given the territory’s strategic importance to the country.

Zelenskyy and Trump met this week at the World Economic Forum in Davos, Switzerland, where Zelenskyy delivered one of his most pessimistic and frustrated speeches to date, lambasting Europe for not taking its own security seriously enough.

“Just last year, here in Davos, I ended my speech with the words: ‘Europe needs to know how to defend itself.’ A year has passed. And nothing has changed. We are still in a situation where I must say the same words again,” Zelenskyy said.