U.S. Vice President Joe Biden speaks during a FIFA World Cup Trophy Tour event, at the U.S. State Department, April 14, 2014 in Washington, DC.

The high-stakes visit comes one day after Russia accused Kiev of violating the Geneva accord.

Representatives of the Muslim community attend the ceremony of the reopening of the basilica of Saint-Augustin in Algeria's eastern city of Annaba, on October 19, 2013.

Algeria's ailing President Abdelaziz Bouteflika looks set to win a fourth term after Thursday's election.

Brazilian President Dilma Rousseff speaks at the end of a ceremony after signing agreements with her Peruvian counterpart Ollanta Humala at the government palace, in Lima on November 11, 2013.

Dilma Rousseff's government apologized to victims of military rule as anniversary of 1964 coup nears.

A soldier guards a polling station, as Afghans defy Taliban threats and vote in record numbers in presidential elections on April 5, 2014, in Kabul, Afghanistan.

The detention of the top Taliban negotiator looks to have stalled hopes to reignite the peace process.

Russian Foreign Minister Sergey Lavrov arrives at Diaoyutai Guesthouse on April 15, 2014 in Beijing, China. Lavrov is on a one-day visit to China.

Russia's foreign minister lambasted Kiev for failing to respect an accord reached in Geneva last week.

Members of jihadist group Al-Nusra Front take part in a parade calling for the establishment of an Islamic state in Syria, at the Bustan al-Qasr neighbourhood of Aleppo, on October 25, 2013.

President Bashar al-Assad is expected to make a bid for another seven-year term in office in the June ballot.

Demonstrators who disagree stand back-to-back during a rally outside of the U.S. Supreme Court during oral arguments in Sebelius v. Hobby Lobby March 25, 2014 in Washington, D.C.

Justices rejected limits on how much individuals can donate during a federal two-year election cycle.