NEW : Ukraine official : the Sea of Azov administration believes U.S. did n't have capability to shoot down plane . In the coming days , finding and examining the plane 's data recorders will be key -- but the fact that the crash occurred in such a volatile region makes what comes next anything Analyst : In volatile region , will there be `` a really objective , international investigation ? '' pro-Russian officials accuse Ukrainian separatists of shooting down the plane . Putin : Ukraine 's military campaign against separatists is to blame .
NEW : Ukraine official : the Sea of Azov administration believes U.S. did n't have capability to shoot down plane . Analyst : In volatile region , will there be `` a really objective , international investigation ? '' pro-Russian officials accuse Ukrainian separatists of shooting down the plane . Putin : Ukraine 's military campaign against separatists is to blame .