ABU DHABI, January 24. /TASS/. The territorial issue is still the most complicated one at the trilateral talks between Russia, the United States and Ukraine in Abu Dhabi and the withdrawal of Ukrainian forces from Donbas remains a priority for Russia, a source close to negotiations told TASS on Saturday.

"This issue remains to be the most complicated," the source said. "The withdrawal of the Ukrainian military from Donbass is important and various security parameters are being considered regarding this issue," the source stated.

On January 22, Russian President Vladimir Putin held a meeting with US Special Presidential Envoy Steve Witkoff and businessman Jared Kushner, which was described as extremely substantive, constructive, frank, and based on trust by Kremlin Aide Yury Ushakov. The talks, focused on the Ukrainian settlement, lasted about four hours.

The parties agreed that the first meeting of a Russia-US-Ukraine working group on security issues would take place in Abu Dhabi on January 23.

On Friday, a source told TASS that the consultations were over, and the sides will inform their respective governments about the preliminary outcomes. At the same time, the participants have agreed to continue dialogue the following day.

The Russian delegation is headed by Igor Kostyukov, chief of the Main Directorate of the General Staff of the Russian Army. The Ukrainian negotiators are led by National Security and Defense Council Secretary Rustem Umerov.