NEW : U.S. Official : Obama administration believes Ukraine did n't have capability to shoot down plane . Analyst : In volatile region , will there be ` ` a really objective , international investigation ? '' Ukrainian officials accuse pro - Russian forces of shooting down the plane . Official : U.S. Vice President Joe Biden said that Ukraine 's president had accepted an offer of U.S. experts to help investigate the crash . Ukraine 's military action against Russia is to blame .
NEW : U.S. Official : Obama administration believes Ukraine did n't have capability to shoot down plane . Analyst : In volatile region , will there be ` ` a really objective , international investigation ? '' Ukrainian officials accuse pro - Russian forces of shooting down the plane . Official : Ukraine 's military action against Russia is to blame .