Saudi Foreign Minister Prince Saud Al-Faisal, right, U.S. Secretary of State Hillary Clinton and Kuwaiti Foreign Minister Sheikh Sabah Khaled al-Hamad Al-Sabah chat prior to a group photo before a US- Gulf Cooperation Council forum at the Gulf Cooperation Council Secretariat in Riyadh, Saudi Arabia, Saturday, March 31, 2012. Secretary Clinton is visiting the region to speak with leaders about local and global issues including Iran as well as attend talks aimed at ending the violence by the Assad regime towards its citizens in Syria.(AP Photo/Brendan Smialowski, Pool)
Saudi Foreign Minister Prince Saud Al-Faisal, right, U.S. Secretary of State Hillary Clinton and Kuwaiti Foreign Minister Sheikh Sabah Khaled al-Hamad Al-Sabah chat prior to a group photo before a US- Gulf Cooperation Council forum at the Gulf Cooperation Council Secretariat in Riyadh, Saudi Arabia, Saturday, March 31, 2012. Secretary Clinton is visiting the region to speak with leaders about local and global issues including Iran as well as attend talks aimed at ending the violence by the Assad regime towards its citizens in Syria.(AP Photo/Brendan Smialowski, Pool)
US Secretary of State Hillary Rodham Clinton during her meeting with the foreign ministers of the Gulf Cooperation Council "GCC" in Riyadh, Saudi Arabia, Saturday, March 31, 2012. Clinton sought to work out a unified strategy on the crisis in Syria in talks with Saudi officials on Friday as further violence stymied U.N. efforts to convince Damascus to implement a cease-fire. (AP Photo/Hassan Ammar)
US Secretary of State Hillary Rodham Clinton, left, arrives with Saudi Foreign Minister Prince Saudi al-Faisal, right, for her meeting with the foreign ministers of the Gulf Cooperation Council "GCC" in Riyadh, Saudi Arabia, Saturday, March 31, 2012. Clinton sought to work out a unified strategy on the crisis in Syria in talks with Saudi officials on Friday as further violence stymied U.N. efforts to convince Damascus to implement a cease-fire. (AP Photo/Hassan Ammar)
U.S. Secretary of State Hillary Rodham Clinton waits before a U.S.- Gulf Cooperation Council forum at the Gulf Cooperation Council Secretariat in Riyadh, Saudi Arabia, Saturday, March 31, 2012. Secretary Clinton is visiting the region to speak with leaders about local and global issues including Iran as well as attend talks aimed at ending the violence by the Assad regime towards its citizens in Syria.(AP Photo/Brendan Smialowski, Pool)
FILE - In this March 26, 2012 file photo, President Barack Obama speaks in Seoul, South Korea. The president is moving ahead with tough new sanctions aimed at squeezing Iran's oil exports after determining there is enough crude on world markets to take the step without harming U.S. allies, The Associated Press has learned. (AP Photo/Susan Walsh, File)
RIYADH, Saudi Arabia (AP) ? U.S. Secretary of State Hillary Rodham Clinton made clear Saturday that time is running out for diplomacy over Iran's nuclear program and said talks aimed at preventing Tehran from acquiring a nuclear weapon would resume in mid-April.
With speculation over a possible U.S. or Israel military attack adding urgency to the next round of discussions in Istanbul set for April 13, Clinton said Iran's "window of opportunity" for a peaceful resolution "will not remain open forever."
She also expressed doubt about whether Iran has any intention of negotiating a solution that satisfies the U.S., Israel and other countries that believe Iran is trying to develop nuclear weapons. Tehran contends the program is solely for peaceful energy and research purposes.
"We're going in with one intention: to resolve the international community's concerns about Iran's nuclear program," Clinton told reporters after attending a security conference in Saudi Arabia.
"Our policy is one of prevention, not containment. We are determined to prevent Iran from obtaining a nuclear weapon," America's top diplomat said.
"We enter into these talks with a sober perspective about Iran's intentions. It is incumbent upon Iran to demonstrate by its actions that it is a willing partner and to participate in these negotiations with an effort to obtain concrete results."
Her remarks followed President Barack Obama's announcement Friday that the U.S. was moving ahead with penalties aimed at depriving Iran of oil revenue, while also working with Saudi Arabia and other Persian Gulf states to ensure ample global petroleum supplies.
Clinton prodded Gulf governments to develop a coordinated defense strategy against Iranian missiles. With tensions rising in the region, she said American and Gulf militaries should cooperate to improve maritime security as well.
Underscoring the limits of U.S.-Gulf cooperation, however, U.S. officials confirmed Saturday that the United Arab Emirates had shut down an American-funded democracy group, following similar Emirates action against a German organization this past week.
Discussions also covered ways to pressure Syrian President Bashar Assad to end a year of bloodshed from the uprising against his rule, but the focus was on Iran.
"It soon will be clear whether Iran's leaders are prepared to have a serious, credible discussion about their nuclear program, whether they are ready to start building the basis of a resolution to this very serious problem," Clinton said. "It is up to Iran whether they are ready to make the right choice. ... What is certain is that Iran's window of opportunity to seek and obtain a peaceful resolution will not remain open forever."
She said pressure from the economic penalties and international isolation was increasing on Iran to show it is serious about satisfying the world's concerns.
Iran and the six nations involved in the negotiations? the United States, Britain, France, Germany, Russia and China ? met in Istanbul 14 months ago. But the talks ended after two days with the sides unable to even agree on what to talk about.
Iran has used past talks to delay sanctions or try to divide the international front, while pressing ahead with its nuclear program.
Obama has underlined the need to give time for diplomacy alongside penalties. He said Friday that the U.S. would move ahead with potential measures against U.S. allies and other countries that keep buying Iranian oil. It was the latest step in the campaign to starve Iran of money for its nuclear activity.
The president said the world oil market was tight, but deep enough to keep the squeeze on Iran.
Clinton, who met Friday for almost two hours with Saudi King Abdullah, said the U.S. and Saudi Arabia share an interest in ensuring stable energy markets that foster economic growth.
She recognized the kingdom's efforts to meet increased market demand for countries weaning themselves off Iranian petroleum imports. She also said the U.S. and Sunni governments of the region would cooperate to counter Iranian threats against shipping in the Gulf and Tehran's support for "the Assad regime's murderous campaign."
Before heading to Turkey for a 60-nation "Friends of the Syrian People" meeting Sunday, Clinton lamented what she called the Assad government's shelling of civilian neighborhoods and targeting of mosques and churches.
She said these attacks have continued despite Assad's acceptance of U.N. mediator Kofi Annan's plan to end the crisis. That plan includes an immediate cease-fire and an eventual democratic transition.
In a concluding statement, the U.S. and the other countries at Saturday's meeting urged Annan to issue a timeline for putting his plan in place.
Western diplomats want to give diplomacy a chance, having invested months of effort to persuade Russia and China, veto-holding members of the U.N. Security Council, to unite behind a common approach. But they, like the Syrian opposition, fear Assad may only be playing for time.
Assad said he wants the plan to succeed, but insists the opposition must first commit to a cease-fire.
The West says the Syrian government must pull back its troops first, and U.S. officials say much of the diplomacy right now concerns the choreography of how the two sides would lay down their arms.
More than 9,000 people have been killed in Syria's violence since last March, according to U.N. estimates.
Gulf countries such as Saudi Arabia and Qatar are among the most impatient and have spoken about possible military intervention, from arming Syria's badly overmatched rebels to creating safe zones from which the rebels can operate.
"I believe we all agree on the need for an immediate cease-fire to the systematic killing," Saudi Foreign Minister Saud al-Faisal said at a news conference with Clinton.
He said the Syrian government's crackdown has "reached the level, at the very least described as crimes against humanity, on which the international community should not remain silent."
Washington fears a military escalation could lead to all-out civil war and play into Assad's hands, considering his vastly more powerful military.
Clinton said officials meeting in Turkey would discuss "additional steps to increase pressure on the regime, provide humanitarian assistance despite the efforts of the regime to block access and advance plans for an inclusive, democratic and orderly transition that addresses the aspirations of the Syrian people."
Clinton also expressed concern about increased pressure across the region on civic groups, in particular those advocating political or democratic reforms. It was an apparent reference to the Emirates' move this past week against the U.S.-based National Democratic Institute and Germany's Konrad Adenauer Foundation.
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Associated Press writer Maggie Michael in Cairo contributed to this report.
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