Nuclear report may show Iran closer to building warhead (VIDEO)

A U.N. report may show that Iran is moving closer to developing an advanced nuclear weapon, having used information from a Russian scientist on how to raise the yield of atomic warheads, Bloomberg reported.

Meanwhile, the White House said Monday that the International Atomic Energy Agency's (IAEA) quarterly report on Iran's nuclear work due out Wednesday would echo the U.S. concerns on Tehran's nuclear program, Xinhua reported.

"What I can tell you is that we certainly expect it to echo and reinforce what we've been saying about Iran's behavior and its failure to live up to its international obligations," White House spokesman Jay Carney told reporters. "And it will, I'm sure, echo our concern about Iran's nuclear program."

The Obama administration will likely use the report to push for an expansion and tightening of international sanctions against Iran, wrote The Associated Press.

Meanwhile, leaked details of the report showed that it would focus on Iran's effort to install nuclear materials to a warhead and develop missiles for delivery.

Citing said three officials, Bloomberg reported that:

The Russian showed Iranian scientists techniques that could be used to make smaller nuclear weapons capable of bigger explosions, according to the government officials, who have been briefed on the U.N. atomic agency's eight-year probe. 

The IAEA's report on Iran, its 34th since inspectors began investigating the country in 2003, may trigger wider consequences, according to Bloomberg.

Israel and the United States have hinted at the possible use of force against Iranian nuclear sites. 

Israel "has warned that all options are on the table regarding a possible military strike against Iran's atomic facilities," according to Bloomberg.

However, Iranian officials have already denounced the IAEA report as "counterfeit," The Guardian reported, adding that there are doubts internationally as to whether the IAEA evidence "will be enough to convince Russia and China to abandon their opposition to further economic sanctions, let alone countenance air strikes."

And according to Russia Today, Moscow has warned that military action against Iran would be a "very serious mistake fraught with unpredictable consequences."

Foreign Minister Sergei Lavrov, responding to comments by Israeli President Shimon Peres that an attack on Iran was becoming more likely, said diplomacy was the only way to solve the standoff over Iran's nuclear program.

Lavrov reportedly said: "Military intervention only leads to a multiple rise in casualties and human suffering. There can be no military solution to the Iranian nuclear problem, just like there can be none for any other problem in the modern world."