LOS ANGELES: Actor Will Smith slaps comedian Chris Rock during the Academy Awards ceremony on Sunday, March 27 (Myung Chun/Los Angeles Times/Getty Images)

ISTANBUL: Russian and Ukrainian delegations meet in Istanbul for talks on Tuesday, March 29 (Arda Kucukkaya/Anadolu Agency/Getty Images)

FOSTER TOWNSHIP: Authorities work at the site of a massive pileup in Foster Township, Pennsylvania, on Monday, March 28. At least six people died afte a sudden snow squall led to the crash on Interstate 81. At least 80 vehicles were involved, according to state police (David McKeown/Republican-Herald/AP)

KAZAKHSTAN: From left, American astronaut Mark Vande Hei and Russian cosmonauts Anton Shkaplerov and Pyotr Dubrov are seen inside their Soyuz spacecraft after it landed in a remote area of Kazakhstan on Wednesday, March 30. The men had just returned from a mission on the International Space Station (Bill Ingalls/NASA/Getty Images)

WANGARATTA: Hot-air balloons take flight in Wangaratta, Australia, on Sunday, March 27 (Quinn Rooney/Getty Images)