Representatives of three European countries threatening to reimpose UN sanctions on Iran over its nuclear program failed to agree with their Iranian counterpart on Tuesday on how to avoid the measures days ahead of a deadline, a diplomat said, Euronews reports.

The discussions in Geneva among representatives of France, Germany, and the United Kingdom "ended without a final outcome," said the diplomat with knowledge of the meeting, speaking on condition of anonymity because they were not authorized to speak publicly about the talks.

The diplomat said efforts would continue to find a solution ahead of a deadline at the end of this month to invoke the so-called snapback mechanism of the 2015 Iran nuclear deal over what the countries have deemed Iran's lack of compliance.

The snapback would mean a return to wide-ranging UN sanctions in place before the deal, including a conventional arms embargo, restrictions on ballistic missile development, asset freezes, travel bans, and a ban on producing nuclear-related technology.