Mitt Romney promised Monday to restore U.S. foreign policy to a traditional role dating back decades, based on exerting global influence through military and economic power, in a major speech two weeks before he debates President Barack Obama on international issues.

In the address at the Virginia Military Institute, Romney argued that Obama is failing to provide the global leadership needed and expected by the rest of the world, especially key allies such as Israel.

Romney cited recent protests and violence in Arab countries, including an attack on a U.S. diplomatic compound in Libya that killed the American ambassador and three others, as examples of a worsening security situation that he blamed on Obama's policies.

"It is our responsibility and the responsibility of our president to use America's great power to shape history --- not to lead from behind, leaving our destiny at the mercy of events," the Republican presidential nominee said, after earlier declaring that "unfortunately, this president's policies have not been equal to our best examples of world leadership and nowhere is this more evident than in the Middle East."

Romney's running mate, Rep. Paul Ryan of Wisconsin, offered a similar criticism on Monday at a campaign appearance in Ohio.

"If you look around the world, what we are witnessing is the unraveling of the Obama foreign policy," the conservative House Budget Committee chairman said, later adding that "if we project weakness abroad, our adversaries are that much more willing to test us, to question our resolve."

In response to Romney's speech, White House spokesman Jay Carney told reporters that the GOP candidate's positions are in most cases similar to Obama's policies, while former Secretary of State Madeleine Albright accused Romney of repeatedly shifting his views.

"I watched the speech with great interest trying to figure out what Governor Romney's policies really are," Albright said on a conference call with reporters set up by the Obama campaign. "This is, I think, the seventh speech he has given on foreign policy over the years, but I think I have come out more confused because he has changed his mind on a number of different issues."

In specific policy examples, Romney called for the United States to join allies in ensuring that rebels fighting government forces loyal to Syrian President Bashar al-Assad get the military hardware they seek. However, he stopped short of calls by some conservatives for Washington to directly arm the rebels.

"In Syria, I will work with our partners to identify and organize those members of the opposition who share our values and ensure they obtain the arms they need to defeat Assad's tanks, helicopters, and fighter jets," Romney said.

He noted that Iran is sending weaponry to Assad's forces "because they know his downfall would be a strategic defeat for them."

"We should be working no less vigorously through our international partners to support the many Syrians who would deliver that defeat to Iran -- rather than sitting on the sidelines," Romney said, making a change from the advance text of the speech that originally called for working "with" international partners. "It is essential that we develop influence with those forces in Syria that will one day lead a country that sits at the heart of the Middle East."

The Obama administration has limited direct aid so far to non-lethal support such as communications equipment. In addition, the United States is vetting rebels and working with Qatar and Saudi Arabia to make sure weapons go to preferred groups.

Administration officials have expressed concern about giving weapons to unvetted rebels for fear that the arms could fall into the hands of terrorists.

Romney also criticized Obama's overall approach to the Arab Spring uprisings in the Middle East and the Israeli-Palestinian conflict.

He argued that last month's attack on a U.S. diplomatic compound in Benghazi, Libya, that killed U.S. Ambassador Christopher Stevens and three other Americans "should not be seen as random."

Instead, Romney said the violence "was likely the work of the same forces affiliated with those that attacked our homeland on September 11th, 2001," making a change from excerpts released in advance that described the attackers as likely the same forces from 9//11.

The recent assault in Benghazi, which took place on the 11th anniversary of the 9/11 attacks on New York and Washington by al Qaeda, is under investigation by U.S. officials, with no formal word yet on exactly who was behind it.

In the United States, the intelligence community believes it was "a deliberate and organized terrorist assault carried out by extremists" affiliated with or sympathetic to al Qaeda.

The Obama administration has been criticized for initially blaming the attack on protests over an anti-Islam film produced in the United States, then acknowledging it was a terrorist attack.

While Romney sought to distinguish himself from Obama on foreign policy, specific proposals he cited remained similar to what the administration is doing.

For example, he called for ending military operations in Afghanistan by the end of the 2014, the same date set by Obama and NATO, and warned of unspecified steps to stop Iran from developing a nuclear weapon. Obama has said all options remain on the table for preventing an Iranian nuclear weapon.

In one distinction, Romney said Monday that under his leadership, "the United States and our friends and allies will prevent them from acquiring nuclear weapons capability," which differs from Obama's pledge to stop Iran from getting a nuclear weapon.

Nuclear capability refers to the process of being able to develop a nuclear weapon -- a lower threshold than Obama's reference -- and Romney's language matched that of his former business colleague, Israeli Prime Minister Benjamin Netanyahu, on the issue.

Polls show Obama gets higher marks than Romney on foreign policy, and the former Massachusetts governor hurt his international credentials on a three-nation trip this summer that included a high-profile gaffe in which he questioned London's preparedness to host the Olympics.