The White House said on Monday that the Iran nuclear report soon to be released by the UN nuclear watch dog will echo the U.S. concerns on the nuclear program of the Islamist state, while it reiterated its effort now is focused on diplomacy.

"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," he added.

The remarks came at a time when a report on Iran's nuclear program will be released by the International Atomic Energy Agency (IAEA) later this week. Leaked details showed that the report will focus on Iran's effort to install nuclear materials to a warhead and develop missiles for delivery.

Carney said that the Obama administration has mobilized the international community in a unprecedented way to "pressure and isolate Iran."

"We now have in place the most aggressive, isolating and debilitating sanctions regime ever, and that regime has had an impact, as the Iranian president himself recently noted," he said.

Carney reiterated that the U.S. will not rule out military strike on Iran, but now Washington is focused on diplomacy.

"We continue to focus on a diplomatic channel, and it is because of the kind of consensus that we've achieved at the international level among our partners and allies in dealing with Iran that we're able to continue to isolate and put pressure on Iran and to insist that Iran get right with the world and live up to its international obligations," he said.