As Iran continues to balk at scheduling new nuclear talks, six world powers are prepared to wait them out.

European diplomats said this week that Iran was giving them the run-around in scheduling a new round of talks.

In the latest salvo in the blame-game over the delay, Iran’s Supreme National Security Council claimed in a statement Friday that it is actually the P5+1 asking to push back the meeting. Deputy EU negotiator Helga Schmid called her Iranian counterpart Ali Bagheri Friday, to ask to delay the meeting ’til February “because the P5+1 isn’t ready,” Iran’s Fars News Agency reported Friday. “Bagheri…asked [the] P5+1 to be committed to the fixed dates in January,” the Iran NSC statement said, implying the six powers were the ones holding up resumed talks.

“Nonsense,” Michael Mann, spokesperson for European Union foreign policy chief Catherine Ashton, fired back. “The reason for the hold-up is not the 3+3. We are ready and have been for a long time.”

“We had at least five calls to push for a January 28-29 meeting in Istanbul – they did not accept,” a western diplomatic source told the Back Channel Friday. “Now we offered new dates in February (as Jan. 28 now too late from a logistical point of view) and we hope that they will finally accept so we can leave these games behind and focus on substance.”

Tehran’s procrastination is meant to show that the Western sanctions are not working and they are in no big hurry to get back to talks, Iran expert Trita Parsi wrote at the Huffington Post Thursday. But it may also be driven by Iranian fears that they will be blamed if the meeting fails, over what Iran sees as a paltry offer, he said in an interview Friday.

But the P5+1 is not going to improve the package to reward the Iranians for not coming, diplomats and analysts told the Back Channel, even as Iran is intent on showing the sanctions are not so devastating that they are desperate for a deal.

“In terms of why [the Iranians are] not coming, their objective is to hold out as long as possible, and draw as significant concessions as possible preemptively,” former State Department Iran advisor Suzanne Maloney told the Back Channel in an interview Friday. “And I think they believe their leverage increases so long as they show they are not desperate for a deal.”

The Iranian calculation that delay favors their negotiating leverage is likely mistaken, Maloney said.

For the United States and P5 partners, “you sit and wait them out,” Maloney, now a senior fellow at the Brookings Institution, said.

“I don’t think we improve the prospects for a deal by signaling” we’re prepared to sweeten the deal, she added. “They don’t put a lot of credibility in any signals we send, anyhow.”

While Iranian sources have suggested they are trying to press the P5+1 to put discussion of sanctions relief on the agenda for a new meeting, western diplomats say it’s simply “not true at all” that the group has resisted discussing sanctions relief, a  European diplomat told the Back Channel Friday.

Former Obama White House Iran strategist Dennis Ross said he expected Iran would likely show up for talks in February or so.

“They have no prospects of getting an improved deal if they don’t come,” Ross, now a senior fellow at the Washington Institute for Near East Policy, told the Back Channel in an interview Friday. And “they run the risk…that pressure will go up.”

The Iranians “want to show they are in no hurry,  that [the pressure] is not working,” Ross suggested. The Iranian calculus is that the longer the talks impasse drags on, and their program advances, “the pressure builds on us,” Ross said. “They believe we don’t really want to use force. …They are playing a very risky game.”

Iranian delay may also be the result of Iranian interest in seeing if Obama’s new national security team modifies US policy towards Iran, Ross said. Incoming Secretary of State John Kerry “in the past has signaled an interest in talking to them,” Ross said Iranian leaders may be thinking. “’Let the new team get on board.’ The truth is–and the Iranians will discover this as well–this is the same president and he is the one who makes the decisions.”

“I will give diplomacy every opportunity to succeed,” Kerry said at his confirmation hearing before the Senate Foreign Relations Committee Thursday. “But no one should mistake our resolve to reduce the nuclear threat. …The president has made it definitive — we will do what we must to prevent Iran from obtaining a nuclear weapon.”

“The Iranians need to understand that there is no other agenda here,” Kerry continued. “If their program is peaceful, they can prove it. That is what we are seeking.”

Maloney agreed Washington doesn’t need to go overboard to correct any Iranian misreading of Obama’s new national security team as being averse to the use of force if diplomacy with Iran fails.

“Ultimately, everyone knows that there’s a real military option,” Maloney said. “Sanctions are bleeding the country dry. … We don’t need to grandstand. We have far more leverage than the Iranians do.”

If and when negotiations resume, however, the United States will have to take a strategic decision “at what point are we prepared to pay to play,” Maloney said. “To put significant sanctions relaxation, even temporary relaxation, on the table.”

(Photo: U.S. Senator John Kerry (D-MA) testifies during his Senate Foreign Relations Committee confirmation hearing to be secretary of state, on Capitol Hill in Washington, January 24, 2013. REUTERS/Jonathan Ernst.)