President of the European Commission Jose Manuel Barroso, Japanese Prime Minister Shinzo Abe, German Chancellor Angela Merkel, Russia's President Vladimir Putin, Britain's Prime Minister David Cameron, U.S. President Barack Obama, French President Francois Hollande, Canadian Prime Minister Stephen Harper, Italian Prime Minister Enrico Letta and European Council President Herman Van Rumpuy arrive for a group photograph on June 18, 2013 in Enniskillen, Northern Ireland.

The G-8 leaders were joined by two representatives of the European Union, European Commission President Jose Manuel Barroso (left) and European Council President Herman Van Rompuy (right).

President Barack Obama meets with Russian President Vladimir Putin during the G-8 Summit at Lough Erne in Enniskillen, Northern Ireland, on June 17, 2013.

Students hold candles in heavy rain as tens of thousands of people attend a candlelight vigil at Hong Kong's Victoria Park on June 4, to mark the 24th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing.

People are seen gathered at Victoria Park during a candlelight vigil held to mark the 24th anniversary of the 1989 crackdown at Tiananmen Square, in Hong Kong on June 4, 2013. More than 100,000 people were expected to attend the candlelight vigil in the former British colony which is the only place in China where the brutal military intervention that ended weeks of nationwide democracy protests in 1989 is openly commemorated.

Chinese tourists watch the customary ceremony of lowering flag at Tiananmen Square on June 3, in Beijing, China.

A portrait of late Chinese leader Mao Zedong is displayed near security cameras on the eve of the 24th anniversary of the bloody military crackdown on protesters near Tiananmen Gate in Beijing Monday, June 3. Activists in China are taking to social media to urge the public to wear black on the 24th anniversary of the bloody military crackdown on protesters who had camped out for weeks on Tiananmen Square.

A Chinese paramilitary policeman guards after the customary ceremony of lowering flag at Tiananmen Square on June 3, 2013 in Beijing, China.

A Palestinian sets fire to a tire during clashes between hundreds of Palestinians and Israeli soldiers outside the Ofer prison after a march marking the 65th Nakba day or "Day of Catastrophe" on May 15, in Betunia near the West Bank city of Ramallah.

A mounted Israeli policeman tries to disperse Palestinian protesters waving their national flag during clashes as demonstrators gathered outside Damascus gate in Jerusalem on May 15, to mark the 65th Nakba or "Day of Catastrophe"

A Palestinian protestor holds a Molotov cocktail and a lighter, ready to be used against Israeli security forces during clashes to mark Nakba Day near the West Bank city of Ramallah May 15. Palestinians clashed with Israeli forces in the occupied West Bank and at East Jerusalem on Wednesday during demonstrations to mark 65 years since what they call the Nakba (Catastrophe) when Israel's creation caused many to lose their homes and become refugees.

Palestinian protesters are stopped by Israeli soldiers during clashes after a rally marking Nakba Day in the Beit Omar village, north the West Bank city of Hebron, on May 15. Nakba Day is the annual day of commemoration of the displacement of Palestinians after the establishment of the state of Israel in 1948.

Filipino activists and workers burn an effigy of Philippine President Benigno Aquino III and US Uncle Sam during a protest rally marking International Labor Day outside the gate of Malacanang presidential palace in Manila, Philippines, on May 1. Thousands of Filipino workers hold Labor Day protests in Manila calling on Philippines President Benigno Aquino III for an immediate wage hike due to increasing cost of living.

Protestors clash with Turkish riot police during the May Day rally in Istanbul, Turkey. Turkish police and protesters clashed in central Istanbul on May 1 after authorities moved to prohibit traditional Labour Day rallies at Taksim Square. Police used water cannons and tear gas against the demonstrators near Taksim Square. Witnesses reported clashes in several neighbourhoods in the area.

Masked policemen take cover behind shields during clashes at a May Day demonstration on May 1, in Istanbul.

Protestors chant slogans as they stand at the windows of the DISK ( Confederation of Revolutionary Trade Unions of Turkey) building on May 1, in Istanbul. Several people were injured on Wednesday as Turkish riot police used water canon and tear gas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul.

Danish Prime Minister Helle Thorning-Schmidt, is met with strong protests during her May Day speech on May 1 at Tangkroen in Aarhus, Denmark.

Demonstrators raise their fists during a demonstration on May 1. A strike stopped ferry services to the Greek islands and disrupted public transport in the capital Athens ahead of May Day protests Wednesday against Greece's prolonged economic austerity policies.

South Korean riot policemen spray tear gas at protesters during a rally marking 123th World Labor Day in Seoul, South Korea on May 1. The protesters attended the demonstration demanding an improvement of working conditions for temporary workers.

An elderly Russian Stalinist stands in front of a column of demonstrators with a portrait of Stalin during a traditional May Day communist demonstration, in Moscow, Russia. People from around the world are marking May 1 (May Day) as International Labour Day.

Former President George H.W. Bush poses for a group photo with the newly-announced Houston Texans cheerleaders.

George H.W. Bush presents a rose to a new Texans cheerleader.

George H.W. Bush wears American flag socks at a ceremony introducing the 2013-2014 Texans cheerleaders.

Russian Prime Minister Dmitry Medvedev stands in his office in Moscow on April 9, 2013, before an interview with a Russian television channel.

Russian President Vladimir Putin had a busy day Monday: (clockwise from top left) Sitting in a Volkswagen XL 1 Hybrid car in Hanover, Germany; laughing with German Chancellor Angela Merkel; arriving at Schiphol airport in The Netherlands; drinking a toast with Dutch Queen Beatrix at the Hermitage Museum in Amsterdam.

Demonstrators participate in a protest near the National Maritime Museum, where Putin was having dinner, in Amsterdam on April 8, 2013. The protesters were denouncing a so-called 'homosexual propaganda ban' in Russia which was enacted in January.

A man attends a gathering of people celebrating the death of former British prime minister Margaret Thatcher, in George Square in Glasgow, Scotland on April 8, 2013.

Anti-Thatcher protesters gather at Trafalgar Square in London on April 8, 2013.

Revelers spray champagne in George Square, Glasgow, on April 8, 2013.

Members of the public dance to mark the death of Baroness Margaret Thatcher on April 8, 2013 in Glasgow.

A pint of milk is left outside the residence of Baroness Thatcher in Chester Square, London, on April 8, 2013.

A South Korean employee, top right, working at the Kaesong Industrial Complex (KIC), speaks to the media upon his arrival at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

A man uses his mobile phone in front of a specialty shop selling North Korean products, at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, on April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

South Korean soldiers patrol at the border with North Korea in the Demilitarized Zone (DMZ) near Imjingak in Gyeonggi-do Province, South Korea, on April 2. North Korea said it plans to restart its five megawatt nuclear reactor that was shut down under an agreement reached at the six-party talks in 2007, a move that will allow the North to extract plutonium from spent fuel rods.

South Korea soldiers inside transit office at the Military Demarcation Line (MDL) near the demilitarized zone (DMZ) in Gyeonggi province, South Korea, on April 3. North Korea on April 3 blocked South Korean employees from entering the industrial complex operated jointly by the two countries, only allowing workers to leave, a Seoul official said.

A US Air Force F-22 Raptor takes off at Osan Air Base, south of Seoul, South Korea, on April 3. The US military said it has deployed two F-22 Raptor stealth jets to South Korea as part of ongoing joint military exercises with South Korea. The deployment of the stealth jets marked the latest show of force against North Korea, which issues daily threats of war amid heightened tensions on the Korean Peninsula.

A North Korean soldier looks at the southern side through a pair of binoculars at the border village of the Panmunjom (DMZ) that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, on March 19. The United States is flying nuclear-capable B-52 bombers on training missions over South Korea to highlight Washington's commitment to defend an ally amid rising tensions with North Korea, Pentagon officials said.

Anti-Proposition 8 protesters are shadowed by a rainbow banner in front of the U.S. Supreme Court in Washington, on March 26. America's top court takes up the delicate and divisive issue of gay marriage on Tuesday when the nine Supreme Court justices consider the legality of a California ballot initiative that limits marriage to opposite-sex couples.

Gay rights supporters rally outside the U.S. Supreme Court as it waits to hear the marriage equality case referred to as Prop 8 in Washington DC, on March 26. The Supreme Court is to hear arguments in the cases of Hollingsworth vs Perry and US vs Windsor. The cases involve a California law known as Proposition 8 that bans same-sex marriages there, and a federal law, the Defence of Marriage Act (DOMA), which keeps the US government from offering benefits to same-sex couples.

Married couple Mike McFarland, left, and Larry Baxley show their support for gay marriage during a rally in front of the U.S. Supreme Court on March 26, in Washington, DC. Today the high court is scheduled to hear arguments in California's proposition 8, the controversial ballot initiative that defines marriage as between a man and a woman.

A protester from Ohio carries a flag outside of the U.S. Supreme Court in Washington on March 26. America's top court takes up the delicate and divisive issue of gay marriage on Tuesday when the nine Supreme Court justices consider the legality of a California ballot initiative that limits marriage to opposite-sex couples.

People line up to enter the U.S. Supreme Court in Washington, March 26.