Nigeria's first lady Patience Goodluck Jonathan waves after arriving from Germany at the Abuja airport October 17, 2012. Afolabi Sotunde/Reuters
First lady Michelle Obama exercises with children from Chicago Public Schools, in her hometown of Chicago, Feb. 28, 2013, as she makes a major announcement helping to bring back physical activity to area schools, while celebrating the third anniversary of her 'Lets Move' program. M. Spencer Green/AP
Chinese President Xi Jinping (l.) and first lady Peng Liyuan wave from their plane upon their arrival at Julius Nyerere International Airport in Dar es Salaam March 24, 2013. Peng is best known in China as a singer who won praise for her advocacy for favorite causes, most notably for children living with HIV/AIDS, and may visit charities related to this while abroad. Thomas Mukoya/Reuters
Former US first lady Rosalynn Carter (r.) and Sierre Leone first lady Sia Nyama Koroma confer at a meeting of the RAND African First Ladies Initiative, Sept. 23, 2011, in New York. Nearly a dozen current and former first ladies gathered to explore ways to grow their leadership roles on issues such as maternal health, girls education, and women's economic development. Diane Bondareff/RAND Corporation/AP
Jordan's Queen Rania (r.) and Turkey's first lady Hayrunnisa Gul attend a welcoming ceremony at the Presidential Palace in Ankara, Turkey, March 5, 2013. Umit Bektas/Reuters
French president-elect Francois Hollande reacting to supporters with his companion Valerie Trierweiler while celebrating his election victory in Bastille Square in Paris, France. In an interview June 7, 2012 on France-Inter radio, Trierweiler said she feels the term 'first ladyl is a bit old-school. Francois Mori/AP
German Chancellor Angela Merkel and her husband Joachim Sauer (r.) stand with the Polish Ambassador Marek Prawda (l.) inside the installation 'Concrete Poetry' by the Polish artist Stanislaw Drozdz during the exhibition 'Door to Door - Poland and Germany' at the Martin-Gropius-Bau in Berlin December 4, 2011. The letters in the installation show the Polish word 'miedzy' meaning in German 'between.' Guido Bergmann/Bundesregierung/Reuters
Bolivia's President Evo Morales (l.) talks with Peru's President Ollanta Humala and first lady Nadine Heredia, as they await the start of the funeral ceremony for Venezuela's late President Hugo Chávez, at the Military Academy in Caracas March 8, 2013. Miraflores Palace/Reuters
North Korean leader Kim Jong-un, accompanied by his wife Ri Sol-ju, waves to the crowd as they inspect the Rungna People's Pleasure Ground in Pyongyang, North Korea. Korean Central News Agency via Korea News Service/AP
In a statement marking the fifth anniversary of Gross's detention earlier this month, Obama hinted that his release could lead to a thaw in relations with Cuba. Many are watching to see if this could lead to an end of the decades-long US economic embargo.
American Alan Gross has been released from a Cuban prison after five years, as part of an agreement that also includes the release of three Cubans jailed in the United States, senior U.S. officials said Wednesday.