The Obama White House’s top nonproliferation official said that the United Nations Security Council would pass a new resolution sanctioning Iran over its nuclear program with Russian and Chinese support, and that Iranian efforts to lobby countries against a new sanctions resolution will fail.

“I am very confident that unless Iran does something significant that demonstrates that it is taking confidence building measures, I am very confident we will get a Security Council resolution that is supported by the majority of the UN Security Council,” White House WMD czar Gary Samore told journalists Tuesday.

“I think we will get a resolution with Russian and Chinese support,” he said. “I believe those countries recognize that Iran has been unresponsive to international demands to limit Iran’s nuclear program.”

Two key non-permanent members of the UN Security Council, Turkey and Brazil, are both sending leaders to Tehran this month to try to negotiate a nuclear fuel deal.

But Samore said the U.S. is convinced Iran does not have a serious interest in a nuclear deal at this point, and that the Brazilian and Turkish efforts are unlikely to achieve a diplomatic breakthrough.

Despite Iranian Foreign Minister Manouchehr Mottaki’s dinner invitation to UN Security Council diplomats last week, and he and Iranian President Mahmoud Ahmadinejad traveling to UN Security Council member states to make the case against the Council taking action, “those arguments have proved not very persuasive,” Samore said.

“The Iranians have frankly not been prepared to accept that offer, it’s pretty clear to anybody,” Samore said. “And Turkey will soon satisfy themselves of that.”

Asked about suggestions from the International Atomic Energy Agency director general Yukiya Amano that he is not sure if Iran is hiding more enrichment facilities such as the one at Qom revealed last September, Samore said Iran’s track record of hidden enrichment facilities would lead one to be suspicious.

“Suffice it to say, given Iran’s record of cheating … anybody naturally would want to pay a lot of attention to that specific threat,” he said.

“Obviously, I couldn’t specifically comment on information” [the U.S. may have] on nuclear facilities, Samore said. But “Iran has demonstrated that it has a tendency to try to build secret enrichment facilities as the best way for it to acquire nuclear weapons options. I think that is key to the effort to slow down their program as best we can.”

But Samore added, Iran’s “nuclear clock is not moving as quickly as some feared, because of problems the Iranians have had in terms of their centrifuges.” He declined to say whether reported western efforts to sabotage components for Iran’s nuclear program are responsible for the problems Iran seems to be having with its centrifuges.

Asked if the U.S. would have a reason to sit on information if it had suspicions about other secret Iranian enrichment facilities, Samore said that the U.S. “obviously would want to make a decision about when to tell the IAEA [to launch an investigation] and when to make it public.”

“If the IAEA had suspicions about a possible secret enrichment plant, it would pursue an investigation of that,” Samore said. “It’s up to them to carry that out.”