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US Defense Secretary Robert Gates, seen here in March 2011, has arrived in Riyadh to meet with Saudi King Abdullah, as the Arabian Peninsula is shaken by spiralling unrest in Yemen. (AFP/File/Charles Dharapak

In this Sunday, April 3, 2011 file photo, Saudi Foreign Minister Prince Saudi al-Faisal, center, arrives at the Gulf Cooperation Council 'GCC' meeting in Riyadh, Saudi Arabia. Inside a Kuwaiti palace, military brass hosted senior NATO envoys to discuss closer ties and possible joint naval maneuvers. At the same time in Tehran, President Mahmoud Ahmadinejad was belittling the Western-allied Gulf states for casting Iran as a regional menace. (AP Photo/Hassan Ammar, File)

An anti-government protestor who was injured in clashes with Yemeni security forces on Sunday night, is helped by other protestors after receiving his medications at a field hospital in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers - including many women - packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. ((AP Photo/Muhammed Muheisen))

An anti-government protestor who was injured in clashes with Yemeni security forces on Sunday night, looks on at a field hospital in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers - including many women - packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. ((AP Photo/Muhammed Muheisen))

Anti-government protestors comfort a wounded demonstrator, who was injured in clashes with Yemeni security forces on Sunday night, at a field hospital in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers - including many women - packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. ((AP Photo/Muhammed Muheisen))

Wounded anti-government protestors, who were injured in clashes with Yemeni security forces on Sunday night, rest in a field hospital in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers - including many women - packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. ((AP Photo/Muhammed Muheisen))

Anti-government protestors who were injured in clashes with Yemeni security forces on Sunday night, lie on a field hospital beds in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers - including many women - packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. ((AP Photo/Muhammed Muheisen))

Boys hold a banner during a demonstration in the the Syrian port city of Banias on April 17, 2011. Photograph: Str/Reuters

A woman holding an umbrella with slogans written on it attends an anti-government rally to demand the ouster of Yemen's President Ali Abdullah Saleh at Sanaa University April 19, 2011. Yemeni police fired in the air near protesters who set up barricades of burning tyres in an industrial city on Tuesday as Gulf mediators tried to bring the sides back to talks on the president handing over power. REUTERS/Ammar Awad

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 19, 2011. REUTERS/Ammar Awad

Women hold a banner during an anti-government rally to demand the ouster of Yemen's President Ali Abdullah Saleh at Sanaa University April 19, 2011. Yemeni police fired in the air near protesters who set up barricades of burning tyres in an industrial city on Tuesday as Gulf mediators tried to bring the sides back to talks on the president handing over power. REUTERS/Ammar Awad

Women shout slogans and hold a banner during an anti-government rally to demand the ouster of Yemen's President Ali Abdullah Saleh at Sanaa University April 19, 2011. Yemeni police fired in the air near protesters who set up barricades of burning tyres in an industrial city on Tuesday as Gulf mediators tried to bring the sides back to talks on the president handing over power. REUTERS/Ammar Awad

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 18, 2011. REUTERS/Ammar Awad

Female anti-government protestors sit on a sidewalk taking shelter from the sun during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Tuesday, April 19, 2011. A Yemeni activist said four anti-government protesters have been wounded after security forces opened fire on demonstrators in south Yemen. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 19, 2011. Yemeni police fired in the air near protesters who set up barricades of burning tyres in an industrial city on Tuesday as Gulf mediators tried to bring the sides back to talks on the president handing over power. REUTERS/Ammar Awad

Female anti-government protestors hold a banner during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Tuesday, April 19, 2011. A Yemeni activist said four anti-government protesters have been wounded after security forces opened fire on demonstrators in south Yemen. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 19, 2011. REUTERS/Ammar Awad

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 18, 2011. Yemeni forces loyal to President Ali Abdullah Saleh fired at a protest march in Sanaa on Sunday,wounding at least 22 people,doctors said, as opposition leaders met Gulf Arab mediators in Saudi Arabia. The words written across a placard with a photo of Saleh read "leave". REUTERS/Ammar Awad

Anti-government protestors shout slogans during a demonstration demanding the resignation of of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Tuesday, April 19, 2011. A Yemeni activist said four anti-government protesters have been wounded after security forces opened fire on demonstrators in south Yemen. (AP Photo/Muhammed Muheise

Anti-government protestors react during a demonstration demanding the resignation of of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Tuesday, April 19, 2011. A Yemeni activist said four anti-government protesters have been wounded after security forces opened fire on demonstrators in south Yemen. (AP Photo/Muhammed Muheisen)

Anti-government protestors gesture while chanting slogans during a demonstration demanding the resignation of of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Tuesday, April 19, 2011. A Yemeni activist said four anti-government protesters have been wounded after security forces opened fire on demonstrators in south Yemen. (AP Photo/Muhammed Muheisen)

Yemeni anti-government protesters shout slogans during a demonstration against President Ali Abdullah Saleh's regime in Sanaa. Yemen's opposition remain adamant that Saleh step down immediately, after a fruitless meeting with Gulf mediators and violent late-night demonstrations in several cities. (AFP/Mohammed Huwais)

Anti-government protesters tear up a poster of Yemen president Ali Abdullah Saleh during a protest calling for hiss ouster, in Sanaa. Yemen's opposition has remained adamant that Saleh step down immediately, ahead of talks set between Gulf mediators and the government. (AFP/File/Mohammed Huwais)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 10, 2011. REUTERS/Ammar Awad

A Yemeni boy adjusts his hat while standing with female anti-government protestors, not pictured, during a demonstration demanding the resignation of of Yemeni President Ali Abdullah Saleh in Sanaa, Yemen, Monday, April 18, 2011. Security forces fired on anti-government protesters in Yemen's capital Sunday as hundreds of thousands of marchers — including many women — packed cities around the country to denounce the president and remarks he made against women taking part in rallies demanding his ouster. (AP Photo/Muhammed Muheisen)

The Arab Revolution of 2011