European governments are warning that UN sanctions on Iran could return if stalled nuclear negotiations do not advance in the coming weeks, according to diplomats cited Monday. The warning adds fresh pressure on Tehran as talks remain stuck over key issues.

The latest dispute underscores how fragile the diplomatic track has become. European officials are signaling that they want measurable progress soon, or they may move to restore penalties that were lifted under the 2015 nuclear deal.

For ordinary Iranians, renewed sanctions risk deepening already severe economic strain, including higher prices and greater isolation from global markets. That human cost remains central as leaders trade deadlines and threats.

The standoff also reflects the wider breakdown in trust between Iran and Western powers. With time running short, diplomats say the next round of talks could determine whether negotiations continue or collapse into a new sanctions crisis.