1
The six improved the offer in June 2008 but retained the precondition.
2
In June last year the six improved the offer but retained the precondition.
3
They improved the offer last year but retained the precondition.
4
They improved the offer last year but retained the suspension demand, something Tehran has repeatedly ruled out as a precondition.
5
They improved the offer last year but retained the demand that Iran suspend uranium enrichment, something Tehran has ruled out as a precondition.
6
They improved the offer last year but retained the demand that Iran suspend uranium enrichment, something the Islamic Republic has ruled out as a precondition.