Russian, Ukrainian, and US negotiators are set to hold tripartite talks in Abu Dhabi on Friday, marking the first such meeting of all three nations since Russia's full-scale invasion nearly four years ago. These crucial discussions follow a "useful" meeting between Russian President Vladimir Putin and US envoys in Moscow, though a long-term peace deal faces significant hurdles over territorial disputes.

• These talks represent the first tripartite meeting involving all three nations since Russia's invasion.
• Key figures involved include Russian President Vladimir Putin, Ukrainian President Volodymyr Zelensky, and US representatives including Jared Kushner and Steve Witkoff.
• A primary sticking point for any peace agreement is the unresolved territorial issue, particularly eastern Ukraine's Donbas region and the Zaporizhzhia nuclear plant.