Washington called for a "new" security framework on the first day of US-led talks between Ukraine and Russia in Abu Dhabi, as Ukrainian President Volodymyr Zelensky said he was "happy" with the changes in approach by US mediators.US leader Donald Trump's envoys -- his son-in-law Jared Kushner and Steve Witkoff -- brought together the warring sides for several hours of negotiations that are set to continue Wednesday.Kushner told delegates the United States had "narrowed the gaps" between the sides -- without providing details -- and hoped to move towards a "solution" to Europe's worst conflict since World War II.