World powers and Iran are to begin a second two-day stint of talks in Geneva over Tehran’s controversial nuclear programme.
Last month’s meeting on the subject ended with positive words from both sides but now the US and its allies want to see action.
Iran must scale back its atomic work if crippling sanctions are to be lifted.
The EU is insisting it is time that concrete progress be made to end the decade-old dispute.
“If the Iranians are prepared to really address the core issues here, then of course we can adjust what we’ve said so far. But our proposals are on the table, remain on the table, and again I would stress that the ball is in the Iranians’ court to really engage on the key issues here,” said Michael Mann who is spokesperson for the EU’s high representative Catherine Ashton.
Iran insists it needs nuclear energy for electricity generation and medical purposes – world powers suspect it’s really seeking an atomic bomb.
There is a lot riding on the diplomatic approach as Israel which sees Tehran as a threat has warned if it fails it could launch pre-emptive strikes against Iranian nuclear sites.