High-stakes trilateral talks between the US, Russia and Ukraine – the first since February – are due to begin in Abu Dhabi on Tuesday, with European engagement. Security guarantees are expected to be central to the two-day discussions, alongside de-escalation, humanitarian measures and prospects for a wider settlement. US envoys Steve Witkoff and Jared Kushner, who is also President Donald Trump's son-in-law, are set to lead the American delegation.