United States To Attack Iran?

According to this Russian news article, the United States, it seems, is prepping to attack Iran.

Russian military intelligence services are reporting a flurry of activity by U.S. Armed Forces near Iran's borders, a high-ranking security source said Tuesday.

"The latest military intelligence data point to heightened U.S. military preparations for both an air and ground operation against Iran," the official said, adding that the Pentagon has probably not yet made a final decision as to when an attack will be launched.

He said the Pentagon is looking for a way to deliver a strike against Iran "that would enable the Americans to bring the country to its knees at minimal cost."

I don’t know how trustworthy this story is as the Russian media is not always reliable, and is increasingly (and willingly) becoming a tool for the state. And if the United States is poised to attack Iraq, is it just saber-rattling or something else all together?