MANAMA, Bahrain - Iran's foreign minister delivered a blunt challenge to the United States on Saturday, saying Tehran is willing to help U.S. troops withdraw from neighboring Iraq but only if Washington makes some tough policy changes.

Foreign Minister Manouchehr Mottaki claimed U.S. troops were responsible for at least half the violence tearing apart Iraq and that their departure would pay security dividends for the entire region.

“If the United States changes its attitude, the Islamic Republic of Iran is ready to help with the withdrawal from Iraq,” Mottaki told the International Institute of Strategic Studies conference here. “Fifty percent of the problem of insecurity in Iraq is the presence of foreign troops.”

Mottaki echoed calls made last week by Iran's top national security official, Ali Larijani, for Gulf Arab countries to eject American bases in their countries and establish a regional security pact with Iran. Mottaki went further and offered deeper cooperation with the six Gulf Arab states on energy, tourism, business and counter-narcotics.

Iran's offers do not seem to have tempted Gulf neighbors who are apparently more worried about the dangers of living near Iran's nuclear facilities, especially amid threats by Washington and Israel to use military force to destroy them.