Donetsk rebel official : Plane shot down , but not by us . Malaysian government says the crash site 's integrity has been compromised . President Obama says evidence points to a missile strike by pro - Russian rebels . We do n't know for sure , but the altitude of the plane -- 32,000 feet -- means the missile must have come from a sophisticated system such as a Buk or Russian-made Russia could face greater international isolation and tougher sanctions .
Donetsk rebel official : Plane shot down , but not by us . Malaysian government says the crash site 's integrity has been compromised . President Obama says evidence points to a missile strike by pro - Russian rebels . Russia could face greater international isolation and tougher sanctions .