The meeting with the leaders of Germany, France, and Britain — known as the E3 — comes at a pivotal time, as Iran continues to enrich uranium to near-weapons-grade levels.
The delivery, containing Iranian oil, violates U.S. sanctions imposed on Tehran after former President Donald Trump pulled America out of a nuclear deal between Iran and world powers three years ago.
The announcement however leaves the International Atomic Energy Agency in the same position it has faced since February, as it is Iran that still possesses all the recordings of its nuclear sites.
Before arriving in Washington, Bennett made clear that he would push against the Iran deal, arguing Tehran has already advanced in its uranium enrichment
The deal's collapse with President Donald Trump's decision to unilaterally withdraw America from the agreement in 2018 spiralled into a series of attacks and confrontations across Middle East.
The U.S. is not directly involved in the talks but an American delegation headed by President Joe Biden's special envoy for Iran, Rob Malley, has also been in the Austrian capital.
France, Germany, Britain, China and Russia are still parties to the deal - known as the Joint Comprehensive Plan of Action - along with Iran.
The group said they would resume further talks next week in Vienna, in order to clearly identify sanctions lifting and nuclear implementation measures.
The Shiite-majority Iraq has been trying to maintain a fine line as allies Tehran and Washington descended into verbal vitriol.
US President Donald Trump reimposes tough, unilateral sanctions against Iran after exiting 'horrible' nuclear deal
Iranians are already seeing the effects of the sanctions, with Iran's rial currency losing around half its value since Trump announced the US would withdraw from the 2015 nuclear accord.
President Donald Trump withdrew the US from the Iran nuclear deal in May to pursue a maximum pressure campaign against Tehran's atomic programme.
Russian President Vladimir Putin too sounded critical of the US decision, saying the move may destabilise the Gulf region.
Noting that Israel had stayed out of Syria's protracted civil war, in which Tehran backs Assad, Netanyahu said increasing Iranian encroachment required "a new calculus".
Iran nuclear chief Ali Akbar Salehi specified that this was just the start of the production process.
The following is a selection of reactions from around the globe to Trump's biggest foreign policy move since taking office.