DUBAI: A senior Iranian nuclear official said on Saturday that the clock was ticking for other parties to salvage a 2015 nuclear deal and that it had the capacity to raise its uranium enrichment beyond 20%, although it had no plans to do so for the time being. “We have started lifting limitations on our Research and Development imposed by the deal … it will include the development of more rapid and advanced centrifuges … all these steps are reversible if the other side fulfils its promises,” Behrouz Kamalvandi, spokesman for Iran’s nuclear agency, said in a televised news conference. “The U.N. nuclear watchdog has been informed about our new nuclear steps and it still has access to our nuclear sites.”