The US has for the first time sensed Russia's real willingness to end the war, Reuters sources say.
According to an unnamed US source, both Ukraine and Russia are now privately demonstrating a willingness to compromise on the territorial issue.
The source says the US is cautiously optimistic about possible progress.
The source also said that one of the main topics of the upcoming negotiations in Abu Dhabi will be security guarantees for Ukraine.
On November 9, the head of the Ukrainian negotiating team, Rostam Umarov, announced that the Ukrainian delegation had set off for Abu Dhabi. Before the tripartite meeting, American representatives are also planning talks with European officials.