Russia and Ukraine have resumed US-brokered peace talks in Abu Dhabi after nine months, with the Donbas dispute, prisoner exchange and European security among key issues. Russia and Ukraine resume US-brokered peace talks in Abu Dhabi.Moscow’s demand for Donbas remains a major obstacle.Discussions also cover prisoner exchanges and European security.Russia and Ukraine resumed US-brokered peace negotiations in Abu Dhabi on Tuesday after a nine-month gap.