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).

Chinese President Xi Jinping and First Lady Peng Liyuan bid farewell as they board their plane to depart from the Julius Nyerere International Airport in Dar es Salaam, Tanzania, on March 25, 2013.

Peng Liyuan observes a moment of silence during a visit to Gongo la Mboto cemetery, where Chinese workers who died while constructing a railway are buried, on the outskirts of Dar es Salaam on March 25, 2013.

South Africa's President Jacob Zuma shares a joke with Peng Liyuan during an official lunch hosted by Zuma and his wife in Pretoria on March 26, 2013.

Secretary of State John Kerry heads an Afghan-made soccer ball towards the captain of Afghanistan's women's national soccer team, Zahra Mahmoodi, as he meets with the women-owned company that makes the ball, and other Afghan women entrepreneurs at the U.S. Embassy in Kabul on March 26, 2013.

U.S. President Barack Obama yawns as he sits between Japan's Prime Minister Yoshihiko Noda, right, and Chinese Premier Wen Jiabao during the plenary session of the 21st ASEAN (Association of Southeast Asian Nations) and East Asia summits in Phnom Penh, Cambodia on November 20, 2012. In his first meeting with a Chinese leader since his re-election, Obama said on Tuesday Washington and its chief economic rival must work together to "establish clear rules of the road" for trade and investment.

President Barack Obama and Secretary of State Hillary Clinton tour the Shwedagon Pagoda in Yangon, Nov. 19. Obama became the first serving U.S. president to visit Myanmar, trying during a whirlwind six-hour trip to strike a balance between praising the government's progress in shaking off military rule and pressing for more reform.

Crowds wave U.S. flags as they line a street outside the home of Myanmar's opposition leader Aung San Suu Kyi as Barack Obama arrives to meet her in Yangon, Nov. 19.

The members of the Council of the Baltic Sea States sit under a model of a whale at the Ozeaneum sea museum as they attend the plenary session of the summit on May 31, 2012 in Stralsund, northeastern Germany.

German Chancellor Angela Merkel speaks with European Commission President Jose Manuel Barroso at the summit opening.

From left: Valentina Pivnenko, chairwoman of the Baltic Sea Parliamentary Conference, Danish Prime MInister Helle Thorning-Schmidt, European Commission President Jose Manuel Barroso, Poland's Prime Minister Donald Tusk, German Chancellor Angela Merkel, Iceland's Prime Minister Johanna Sigurdardottir, Lithuania's Prime Minister Andrius Kubilius and Finland's Prime Minister Jyrki Katainen feed penguins at the Oceaneum during the summit in Stralsund.

Merkel, Barroso and other leaders visit one of the oldest harbor pubs in Europe after a dinner at the start of their summit in Stralsund, May 30, 2012.