A U.S. diplomatic spokesperson contended that “we can quickly reach and implement an understanding on getting back to the deal based on seven rounds to date of careful negotiations if Iran is serious. But we have not yet seen sufficient urgency demonstrated by Iran... The last couple rounds also started with new nuclear provocations and then were characterised by, in some cases, vague, unrealistic, unconstructive positions on the part of Iran”. “Iran needs to exercise restraint in its nuclear program and add real urgency in Vienna”, he insisted, while noting: “we are actively engaging with our allies… on alternatives. And we are very ready and willing to pursue those alternatives if Iran demonstrates that it is not sincere”.