Defining pictures of 2016: From Syria civil war to US elections, a glimpse into the year that was

The barrel of a tank protrudes as it moves across challenging terrain during a competition in Alabino, outside Moscow, Russia, on July 30, 2016. The competition, called the International Army Games, involves troops from Russia and several other nations. (Vadim Savitsky/Russian Defense Ministry Press Service pool photo via AP, File)

Ieshia Evans is detained by law enforcement as she protests the shooting death of Alton Sterling near the headquarters of the Baton Rouge Police Department in Louisiana, U.S. July 9, 2016. Jonathan Bachman: 'A woman standing calmly, her long dress moving in the breeze, two police officers in full riot gear make their move. I was on assignment for Reuters in Baton Rouge to cover the protests over the fatal police shooting of Alton Sterling. Moments before I captured this image of Ieshia Evans I had my back turned photographing face-to-face confrontations between the police and the demonstrators. I heard someone behind me say something like "don't stand there, they are arresting people in the street." I turned and looked over my right shoulder and saw this woman standing in the road. I knew right away what was about to happen. The police were going to arrest her. I quickly moved and took the shot. When I came back to my car and looked through my take I knew I had a strong image. However I didnÕt anticipate that the image would go viral. I am grateful that it has stimulated a discussion about an important issue in this country.' REUTERS/Jonathan Bachman

FILE PHOTO - A girl and a woman sit inside the car as firecrackers and fireworks explode celebrating the start of the Chinese Lunar New Year of Monkey in Beijing just before midnight February 7, 2016. REUTERS/Damir Sagolj/File Photo REUTERS

FILE PHOTO - U.S. President Barack Obama dances tango during a state dinner hosted by Argentina's President Mauricio Macri at the Centro Cultural Kirchner as part of President Obama's two-day visit to Argentina, in Buenos Aires March 23, 2016. REUTERS/Carlos Barria/File Photo REUTERS

A car bomb explodes next to Iraqi special forces armored vehicles as they advance toward territory held by the Islamic State group in Mosul, Iraq, on Nov. 16, 2016. (AP Photo/Felipe Dana, File)

A diver takes part in a training session at the Maria Lenk Aquatic Center ahead of the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Aug. 5, 2016. (AP Photo/Wong Maye-E, File)

Asal Ahmed, 4, is carried by her father at the scene of a massive suicide truck bomb attack in Karada, Iraq, on July 9, 2016. (AP Photo/Hadi Mizban, File)

President-elect Donald Trump takes the stage at a rally at Hy-Vee Hall, Thursday, Dec. 8, 2016, in Des Moines. (AP Photo/Andrew Harnik)

President Barack Obama hugs Democratic Presidential candidate Hillary Clinton after addressing the delegates during the third day session of the Democratic National Convention in Philadelphia, on July 27, 2016. (AP Photo/Carolyn Kaster, File)

Red deer fight during the rutting season at a wildlife park on a fall day in Bonn, western Germany, on Oct. 27, 2016. (AP Photo/Markus Schreiber, File)

In this frame grab taken from video provided by the Syrian anti-government activist group Aleppo Media Center (AMC), 5-year-old Omran Daqneesh sits in an ambulance after being pulled out of a building hit by an airstrike in Aleppo, Syria, on Aug. 17, 2016. The White Helmets were among the crowd of first responders who pulled Daqneesh and his family from the rubble of their apartment building. (Aleppo Media Center via AP, File)

Floral Spinner is washed down after a Handicap Hurdle horse race during Classic Chase Day at Warwick Racecourse, Warwick, central England, on Jan. 16, 2016. (David Davies/PA via AP, File)

Migrants, most from Eritrea, jump into the water from a crowded wooden boat as they are helped by members of an NGO during a rescue operation in the Mediterranean sea, about 13 miles north of Sabratha, Libya, on Aug. 29, 2016. Thousands were rescued from more than 20 boats by members of Proactiva Open Arms before being transferred to the Italian cost guard and other NGO vessels operating in the area. (AP Photo/Emilio Morenatti, File)

An Indian paramilitary soldier falls as he tries to kick an exploded tear gas shell thrown back by protesters at the end of a day-long curfew in Srinagar, India on Aug. 8, 2016. Kashmir had been under a security lockdown and curfew since the killing of a Hizbul Mujahideen commander Burhan Wani on July 8 sparked some of the largest protests in recent years. (AP Photo/Dar Yasin, File)

Jim Kowalczik plays with Jimbo, a 1500-pound Kodiak bear, at the Orphaned Wildlife Center in Otisville, N.Y., on Sept. 7, 2016. (AP Photo/Mike Groll, File)

People kick and beat a Turkish soldier that participated in an attempted coup, on Istanbul's Bosporus Bridge, on July 16, 2016. Turkish President Recep Tayyip Erdogan told the nation that his government was working to crush a coup attempt after a night of explosions, air battles and gunfire across the capital that left dozens dead and scores wounded. (AP Photo/Selcuk Samiloglu, File)

A car makes its way on a winding road through flowering canola fields on the L401 highway near Nienstedt, Germany, on May 12, 2016. (Julian Stratenschulte/dpa via AP, File)

Serbia's Novak Djokovic lies on the clay in a heart he drew after defeating Britain's Andy Murray during their final match of the French Open tennis tournament at the Roland Garros stadium on June 5, 2016, in Paris. Djokovic won 3-6, 6-1, 6-2, 6-4. (AP Photo/David Vincent, File)

Daniele Ferreira dos Santos holds her son, Juan Pedro, who was born with microcephaly, outside her house in Recife, Pernambuco state, Brazil, on Jan. 26, 2016. Santos was never diagnosed with Zika, but she blames the virus for her son's defect and for the terrible toll it has taken on her life. (AP Photo/Felipe Dana, File)

Members of "Vella de Xiquets de Valls" try to complete their human tower during the 26th Human Tower Competition in Tarragona, Spain, on Oct. 2, 2016. The tradition of building human towers, or Castells, dates back to the 18th century and takes place during festivals in Catalonia, where "colles," or teams, compete to build the tallest and most complicated towers. The structure of the castells varies depending on their complexity. A castell is considered completely successful when it is loaded and unloaded without falling apart. The highest castell in history was a 10 floor structure with 3 people in each floor. In 2010 castells were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti, File)