Russia and Iran have not publicly confirmed or denied the request, and the White House did not immediately respond to Bloomberg's request for comment.
But Kremlin spokesman Dmitry Peskov said, while responding to questions sent by the outlet, that "Russia believes that the United States and Iran should resolve all problems through negotiations."
He added that Moscow "is ready to do everything in its power to achieve this."
Esmaeil Baghaei, a spokesman for Iran's foreign ministry, said it is "natural" for countries to offer to help, given the significance of the matters.