US president pessimistic about negotiations, while Omani mediator says Iran agreed to never stockpile enriched uranium in 'breakthrough' that could prevent war; Rubio to Israel Monday US President Donald Trump said Friday that he was “not happy” with Iran’s conduct in nuclear negotiations after the sides held a third round of talks in Geneva but that he hadn’t made a decision on whether to authorize a military strike on the Islami... [6814 chars]