U.S. foreign policy is largely directed by presidents, but Congress does have considerable influence, as this CFR Backgrounder explains.

Despite concerns over Iran’s nuclear program, the Obama administration has assessed that Tehran is years from a developing a long-range missile capable of delivering a nuclear weapon. But past Irania…

Buoyed by high oil prices, Russia finds itself embroiled in a number of disputes with foreign firms looking to tap its underdeveloped oil fields and with its neighbors that grew used to subsidized ga…