After the meeting in Berlin, US Secretary of State Anthony Blinken and European allies stressed that it was still possible to restore the Iranian nuclear deal, but that "time is running out".
According to the report, Anthony Blanken told reporters that negotiators working in Vienna to secure the 2015 agreement with Iran had seen some progress in the past two weeks but did not take it lightly.
"After talking to all my colleagues, I think it is still possible to return to mutual consent," said Anthony Blanken.
Speaking at a joint news conference, German Foreign Minister Analina Berbach said immediate progress was needed in negotiations to save the agreement.
He said that the way to find a solution was getting blocked.
"Negotiations are at a decisive stage, we need immediate progress, otherwise we will not be able to reach a joint agreement," he said.
French Foreign Minister Jean-Yves Le Drian, who is in Berlin to discuss the Ukraine crisis, warned that talks with Iran could not proceed so slowly.
He complained that progress in the meetings was incomplete, distrustful and lazy.
He added that it was now important to pick up the pace or risk failure.
Anthony Blanken agreed that this was a crucial moment for negotiations, saying that time was running out to reach an agreement.
His comments came a day after US President Joe Biden confirmed the progress of talks with Iran, saying "this is not the time to give up."
Negotiations between Iran and world powers to restore a landmark agreement began last year, involving the United States, France, Britain, Russia, China and Germany, but ended in June with the election of Iran's most conservative president, Ibrahim Raisi. The talks stalled.
Negotiations on the so-called JCPOA agreement resumed in November.
Anthony Blanken said last week that there were only a few weeks left to save the agreement and that the United States was ready to consider other options if the talks ended.
The agreement offers relief to Iran from sanctions imposed to halt its nuclear program that have paralyzed Iran's economy.
Former US President Donald Trump's unilateral withdrawal from the agreement in 2018 gave Iran a chance to renege on its promises.
In addition to confirming the easing of sanctions, Iran is seeking assurances that Washington will not withdraw from the agreement.
