US officials said the Biden administration conveyed its nuclear concerns to the Iranians several weeks ago, both through a third country and direct channels.
The US officials added that the Iranians came back with a response that included explanations for these nuclear activities, stressing there has been no change in policy and they are not working on a nuclear weapon.
The exchange of messages and other information obtained by the US and Israel addressed some of the concerns and somewhat eased anxieties over the Iranian research and development activities, US and Israeli officials told Axios.
"We do not see indications that Iran is currently undertaking the key activities that would be necessary to produce a testable nuclear device," a US official told the site.
"We take any nuclear escalation by Iran incredibly seriously. And, as the President has made clear, we are committed to never letting Iran obtain a nuclear weapon—and we are prepared to use all elements of national power to ensure that outcome." READ MORE