US to mediate trilateral talks with Ukraine, Russia in Abu Dhabi next week, US envoy says Al-Monitor. The US will bring together delegations from Ukraine and Russia in the UAE capital next week to discuss ending Moscow’s war against Ukraine. United States to mediate working-level talks between Ukraine and Russia on November 10-11 in Abu Dhabi The U.S. will host a second high-level trilateral meeting between Ukraine and Russia in Abu.