Antalaya (Yurkey), Apr 7 (UNI/Sputnik) Negotiations over Iran remain challenging, with the parties holding sharply opposing views on core issues, a Turkish government source told Sputnik.On Monday, US President Donald Trump said that the US-Iran talks were continuing and "going fine," noting involvement from Vice President JD Vance and Special Envoy Steve Witkoff."The Iran negotiations are unfolding in a highly tense atmosphere, with the sides' stances on several key points still diametrically opposed. This complicates compromise and demands additional diplomatic efforts," the source said.Discussions persist, but there is no sign of quick breakthroughs at this stage, the source added.Turkey is closely tracking developments and supports a di...