After weeks of tense negotiations aimed at preventing Iran from obtaining a nuclear weapon, the Trump administration has offered a concession that may open a path to a compromise.

Over the weekend, the United States proposed the outline of a deal that would seem to allow Iran to temporarily continue enriching uranium. That has been a sticking point in the talks, which have been at an impasse.

President Trump has consistently berated Iran’s leadership, and the countries have been at odds for many decades. But shifts in geopolitics and Mr. Trump’s wish to secure a legacy-making deal have sent his aides back to the negotiating table. Failed talks could lead to a destructive regional war.

Under the proposal, which Iranian and European officials described on the condition of anonymity, Iran could produce enriched uranium temporarily while the United States facilitates building nuclear power plants for Iran. A consortium of countries in the region would manage uranium enrichment facilities to provide nuclear fuel for the plants.

Iran would then have to stop all enrichment within its borders once it begins receiving any benefits from those facilities.

Here is what you need to know.