The Abu Dhabi trilateral peace talks concluded on Tuesday without a breakthrough, but US negotiators announced immediate missions to Moscow and Dublin in a bid to break the deadlock.
American participants reported "some openings" but acknowledged the hardest round since February failed to produce a viable cease-fire or security framework.
Davyd Arakhamia, a Ukrainian negotiator, called the session one of the hardest, citing Russia's strict directives, yet he noted good momentum and urged a swift second round.
Moscow and Kyiv confirmed a large-scale prisoner exchange could be implemented soon, while the US team scheduled trips for Thursday-Witkoff to meet President Putin in Moscow and Kushner to discuss with President Zelensky in Dublin.
The agenda centered on Europe's security architecture, with Kyiv seeking Nato guarantees and Moscow demanding limits on alliance expansion, highlighting the deep divide over a future framework.
European allies, including Britain, Nato and EU representatives, attended in Abu Dhabi but the Kremlin said it had no contact with them, reflecting ongoing friction over the peace process.
Any final accord remains tied to ending the war, with territorial disputes in Donetsk the core obstacle, and officials warn trust between the warring sides is still lacking.