Russian, Ukrainian and US negotiators will hold talks in the United Arab Emirates later, in what officials say will be the first meeting attended by all three countries since Moscow launched its full-scale invasion nearly four years ago. The Kremlin confirmed Russian officials would attend the talks following a meeting between President Vladimir Putin and US envoys in Moscow. Russia described those talks as 'useful in every respect', but said a long-term peace deal could not be reached until territorial issues had been resolved. Ukrainian President Volodymyr Zelensky said he regarded the Abu Dhabi talks as 'a step - hopefully towards ending the war'. Present at the Thursday night meeting with Putin and two other Russian aides were three US representatives, including Steve Witkoff and Donald Trump's son-in-law Jared Kushner. Kremlin aide Yuri Ushakov said the talks were 'substantive, constructive and very frank', but reiterated that any agreement for durable peace would not be possible without resolving territorial issues. Until this is achieved, Russia will continue to consistently pursue the objectives of the special military operation. "Without resolving the territorial issue according to the formula agreed upon in Anchorage, there is no hope of achieving a long-term settlement," Ushakov emphasized. Zelensky mentioned a 20-point US plan to end the war was nearly complete. The territorial sticking points include Russia's demand that Ukraine give up the 25% of the Donetsk region that Kyiv still controls. The head of Ukraine's national security and defense council and other officials are expected to join the talks in the UAE, along with the Russian delegation led by General Igor Kostyukov.