ABU DHABI: Negotiators from Ukraine, Russia and the United States were set to gather in Abu Dhabi on Wednesday, seeking to advance fraught talks on how to end the four-year war. Several rounds of diplomacy between the sides have failed to strike a deal on ending Europe’s deadliest conflict since World War II, which began when Russia invaded in February 2022.

Second round of talks to follow negotiations last month that appeared to make little progress on key issue of territory.

Russia confirmed that a new round of talks with Ukraine and the United States on ending the four-year war will begin Wednesday in Abu Dhabi after being...