(AP) CAMP DAVID, Md. - President Barack Obama and leaders of other major industrial powers stepped outside discussions of European economic woes and Afghanistan that will dominate a long weekend of summitry for a look Friday at options to solidify world resolve against development of an Iranian nuclear bomb and encourage a more forceful response to worsening violence in Syria.
Obama will have the ear of key players on both issues during back-to-back G-8 and NATO summits. Discussion will be aimed directly and indirectly at Russia, a sometime protector of both Iran and Syria and the chief blockade to such U.S. goals as an arms embargo on Syria.
The gatherings come in the shadow of the eurozone debt crisis and plummeting public support for the war in Afghanistan. Political and economic chaos in Greece and Spain underscored just how fragile Europe's economy remains after an eviscerating austerity regime. Germany's finance minister predicted Friday that the crisis could last up to another two years.
Most of the leaders are part of overlapping international coalitions formed to address the Iranian nuclear problem and the newer crisis in Syria, where an estimated 9,000 people have died in more than a year of violence that arose from the pro-democracy Arab uprisings.
Russian Prime Minister Dmitry Medvedev will be part of a discussion focused on Syria and Iran on Friday evening among the G-8 industrial nations. Faced with implacable Russian opposition to significant new United Nations punishments on the Syrian regime of President Bashar Assad, U.S. officials are trying to get consensus among other allies about ways to promote Assad's ouster.
A senior U.S. official said one goal of Friday's closed-door discussion at the secluded presidential retreat in Camp David, Md., was to impress on Medvedev that other nations that share Russia's usual role at the forefront of international diplomacy are seeking ways to address the Syria debacle without Russian help.
Obama greeted each leader by name, calling Medvedev "my friend," before the group went inside for dinner.
The United States wants to avoid escalating a confrontation with Moscow over Syria, the official said, but wants Medvedev to hear the depth of international outrage. The official spoke on condition of anonymity to discuss internal diplomacy.
Russia is a partner with the United States and European nations in containing Iran's nuclear program, although with China it has blocked the most severe penalties the United Nations Security Council might impose. A U.N.-affiliated negotiating group including Russia will meet with Iranian officials next week in Baghdad, Iraq.
White House national security adviser Tom Donilon predicted ready consensus among the leaders that tough economic sanctions must continue even while a once-dormant diplomatic process shows new life. U.S. officials say the economic pressure of sanctions is key to drawing Iran back to the bargaining table this spring after a long hiatus.
"Each member of the G-8 is a core member of this sanctions effort," Donilon said Thursday. "Each member has been absolutely essential to really putting in place what has been an extraordinarily effective and, I think most people would say, surprisingly effective sanctions effort."
The G-8 gathering is expected to produce a statement by the leaders on Iran, which would reinforce the diplomatic effort to prevent Iran's nuclear work from progressing to the point of a bomb. Iran denies it is seeking a bomb. A possible deal could allow Iran to enrich uranium at a lower level than needed to build weapons, with sanctions easing as Iran shows it is scaling back more troublesome work.
Iran says it is enriching only to create nuclear fuel. Its refusal to halt enrichment has provoked U.N. and other sanctions, including U.S. and European Union penalties meant to cripple its oil exports its main revenue source that are to fully take effect in a few weeks.
"The message will be that the Iranians should seize this opportunity" for talks, Donilon said. "And while this goes on, in parallel, the sanctions and pressure effort will continue, led by the United States and the others who will be at the table on Friday evening."
Syria is a much harder case, in part because Russia and China oppose U.N. action that could set a precedent for outside interference in internal ethnic or human rights matters, and partly because there is no international appetite for a military confrontation with Assad.
Syrian forces on Friday fired on protesters holding the largest opposition marches yet in Aleppo, a sign of rising anti-regime sentiment in the country's biggest city, which has largely remained supportive of President Bashar Assad throughout the 15-month uprising.
The head of the U.N. observer mission in Syria warned that neither his team nor armed action could solve the country's crisis, and called on all sides to discuss a solution. But the regime kept up its assaults on opposition areas and protests, while the head of Syria's largest exile opposition group dismissed the U.N.'s plan as unrealistic.
The White House abruptly moved the G-8 session to Camp David earlier this spring, after months of planning for a Chicago venue. A desire for seclusion and intimacy was one reason and a gesture to Russia was another.
Russia is opposed to a NATO plan for a missile defense shield in Europe that will be detailed at the NATO summit Sunday in Chicago, causing Russian President Vladimir Putin to let NATO know he did not want to be invited to the alliance meeting.
Separating the two sessions was supposed to make it easier for Putin to attend one and not the other. But Putin made his own abrupt change, telling Obama last week that he would skip the gathering and send Medvedev in his place.
The administration denied speculation that the sessions were moved for security reasons. Past G-8 meetings have seen large and sometimes violent protests by activists opposed to the increasing globalization of world economies. Street violence overshadowed the 2001 summit in Genoa, Italy. Critics have accused the G-8 of representing the interests of an elite group of industrialized nations to the detriment of the needs of the wider world. Since Genoa, the meetings have been held in increasingly isolated locations to shield leaders from protests, playing into criticism of the G-8's closed-door image.
Obama, an infrequent visitor to Camp David, is putting the presidential hideaway on full display for the G-8, the largest gathering of foreign leaders ever to assemble there. The leaders will stroll leafy paths to rustic meetings halls and bed down in the 11 residential cabins. Four African leaders will join them for lunch Saturday.
The G-8 is made up of the leaders of the United States, Japan, Britain, Germany, France, Italy, Canada and Russia. The meetings began in 1975 at a forum instigated by France, where leaders of the six largest economic powers agreed to annual meetings. Canada joined a year later, making it the G-7. Russia was brought into the organization in 1997, six years after the collapse of the Soviet Union. The European Union is represented but is not granted the power to act as host of the annual sessions or to serve as the rotating leader.
Obama holds the chairmanship this year.