Photos: John Kerry's travels U.S. Secretary of State John Kerry shakes hands with Nigerian President Muhammadu Buhari on Wednesday, May 29, shortly after Buhari's inauguration in Abuja, Nigeria. Hide Caption 1 of 27

Photos: John Kerry's travels Kerry is welcomed by Russian President Vladimir Putin at the presidential residence of Bocharov Ruchey in Sochi, Russia, on Tuesday, May 12. Hide Caption 2 of 27

Photos: John Kerry's travels Kerry speaks with China's State Councilor Yang Jiechi at the Diaoyutai State Guest House on May 16 in Beijing. Kerry is urging China to halt increasingly assertive actions it is taking in the South China Sea. Hide Caption 3 of 27

Photos: John Kerry's travels Italian Foreign Minister Paolo Gentiloni, from left, Luebeck's Mayor Bernd Saxe, German Foreign Minister Frank-Walter Steinmeier and Kerry take a boat cruise during a meeting of G-7 foreign ministers in Luebeck, Germany, on April 15. The foreign ministers met to discuss global political and security issues ahead of a G-7 summit to take place in June 2015 in southern Germany. Hide Caption 4 of 27

Photos: John Kerry's travels Kerry rides his bike on March 16, during a break in talks in Lausanne, Switzerland, about Iran's nuclear program. Hide Caption 5 of 27

Photos: John Kerry's travels Kerry listens to a talk during the 51st Munich Security Conference in Munich, Germany, on February 8. The Ukraine conflict, ISIS jihadists and the wider "collapse of the global order" occupied the world's security community at the annual meeting. Hide Caption 6 of 27

Photos: John Kerry's travels Kerry walks off the plane at Kiev Boryspil International Airport in Kiev, Ukraine, on February 5. His visit came as international pressure grew for an immediate halt to surging violence. Hide Caption 7 of 27

Photos: John Kerry's travels Kerry walks with French Foreign Minister Laurent Fabius in Paris on January 16 through a memorial to the victims killed in the attack on the satirical newspaper Charlie Hebdo. Hide Caption 8 of 27

Photos: John Kerry's travels Kerry and U.S. President Barack Obama meet with Zhang Dejiang, chairman of the Standing Committee of China's National People's Congress, on November 12, 2014, at the Great Hall of the People in Beijing. Hide Caption 9 of 27

Photos: John Kerry's travels During a tour of the Berlin Wall memorial on October 22, 2014, in Berlin, Kerry and German Foreign Minister Frank-Walter Steinmeier, left, chat with Regina Webert-Lehmann, who in 1989 fled from communist East Germany in her Trabant car (pictured) to Hungary shortly before revolutions swept Eastern Europe. Kerry and Steinmeier met with students and walked along a still-standing portion of the wall that divided East and West Berlin and whose fall 25 years ago marked the end of the Cold War. Hide Caption 10 of 27

Photos: John Kerry's travels Egyptian Foreign Minister Sameh Shoukry, from left, Kuwaiti Foreign Minister Sabah Al-Khalid al-Sabah, Saudi Foreign Minister Prince Saud al-Faisal, Kerry, Omani Foreign Minister Yussef bin Alawi bin Abdullah, Bahraini Foreign Minister Sheikh Khaled bin Ahmed al-Khalifa and Lebanese Foreign Minister Gebran Bassil stand together for a photo of the Gulf Cooperation Council and regional partners on September 11, 2014, in Jeddah, Saudi Arabia. Kerry and regional counterparts discused forming a coalition to support an American campaign against ISIS jihadists in Syria and Iraq. Hide Caption 11 of 27

Photos: John Kerry's travels Kerry looks out over Baghdad, Iraq, from a helicopter on September 10, 2014. Kerry flew into Iraq for talks with its new leaders on their role in a long-awaited new strategy against ISIS militants. Hide Caption 12 of 27

Photos: John Kerry's travels Kerry visits a replica of Captain Cook's ship Endeavour at the Australian National Maritime Museum in Sydney on August 11, 2014. Hide Caption 13 of 27

Photos: John Kerry's travels Kerry kicks around a soccer ball during an airplane refueling stop at Sal Island, Cape Verde, on Monday, May 5, 2014. Kerry was on his first major tour of Africa, focusing on some of the continent's most brutal conflicts. Hide Caption 14 of 27

Photos: John Kerry's travels Kerry visits patients at the Fistula Clinic at St. Joseph's Hospital in Kinshasa, Congo, on Sunday, May 4, 2014. Hide Caption 15 of 27

Photos: John Kerry's travels Kerry talks with the crew of a U.S. Air Force plane prior to departure from Addis Ababa, Ethiopia, on Friday, May 2, 2014. He was en route to Juba, South Sudan, to demand a cease-fire in the brutal civil war that has sparked dire warnings of genocide and famine. Hide Caption 16 of 27

Photos: John Kerry's travels Kerry looks out a window moments before meeting with Algerian President Abdelaziz Bouteflika in Zeralda, Algeria, in April 2014. Hide Caption 17 of 27

Photos: John Kerry's travels Kerry stands beside a barricade at the Shrine of the Fallen in Kiev, Ukraine, in March 2014. It was part of his trip to Europe in search of a diplomatic solution to the crisis in Ukraine. Hide Caption 18 of 27

Photos: John Kerry's travels Kerry talks to reporters on a boat on the Mekong River Delta in Vietnam in December. Kerry had patrolled the muddy waters 40 years earlier as a U.S. naval officer. Kerry also visited Ho Chi Minh City and Hanoi. Hide Caption 19 of 27

Photos: John Kerry's travels Kerry checks his cell phone in Geneva, Switzerland, prior to a November 2103 meeting with Iran's foreign minister and the European Union's high representative for foreign affairs. Hide Caption 20 of 27

Photos: John Kerry's travels In May 2013, Kerry met with Russian President Vladimir Putin and visited the St. Basil Cathedral in Moscow's Red Square. Hide Caption 21 of 27

Photos: John Kerry's travels Kerry boards a plane in Amman, Jordan, where in May 2013 he met with leaders to discuss the ongoing conflict in Syria. Hide Caption 22 of 27

Photos: John Kerry's travels During a flight from Kabul, Afghanistan, to Paris in March 2013, Kerry presents a birthday cake to traveling CBS correspondent Margaret Brennan. Hide Caption 23 of 27

Photos: John Kerry's travels In March 2013, Kerry met with leaders of the Syrian Opposition Coalition in Istanbul and pledged once again to increase U.S. assistance. Kerry then traveled to Brussels to discuss NATO's post-2014 mission in Afghanistan.

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Photos: John Kerry's travels Kerry's third trip as secretary of state focused on promoting peace in the Middle East. He visited Turkey, seen here, and Egypt before heading to London for a meeting of G8 foreign ministers. Hide Caption 25 of 27

Photos: John Kerry's travels Kerry touches down in Rome during a hectic nine-day trip in February 2013. Kerry accompanied President Barack Obama to Europe, Israel, Jordan and several Palestinian territories. Hide Caption 26 of 27