Diplomats from the U.S., Europe and Iran are set to return to Vienna after months of deadlock for another attempt to save their moribund nuclear deal, as high energy prices continue to stalk the global economy.

Axar.az reports citing foreign media that Robert Malley, the United States' special envoy for Iran, said in a tweet that he’s headed to the Austrian capital to discuss a European Union proposal to rescue the landmark 2015 agreement.

The accord slowly collapsed after then-President Donald Trump withdrew four years ago and reimposed sanctions on the Iranian economy, prompting Tehran to ramp up its enrichment of uranium. The EU’s chief nuclear negotiator, Enrique Mora, and his Iranian counterpart, Ali Bagheri Kani, said that they would also rejoin the talks.