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Security Watch Game changer in Ukraine? World leaders call for swift investigation into downed flight MH17

Ukrainian and Russian leaders are trading accusations over the downing of Malaysia Airlines Flight MH17. Crash investigators will have to overcome working in a war zone.

Dmitry Lovetsky/AP

World leaders are calling for a swift, objective investigation into who shot down Malaysia Airlines Flight 17, while accusations continue to fly between the Russian and Ukrainian governments and war zone conditions pose a challenge to the integrity of the investigation.