first, i'm a european - and we know what an invasion by russia looks like and means.
second, the plane was avoiding a storm, and was still supposed to be in safe height (nobody thought putin would allow to provide such weaponry to the terrorists)
third, the plane was jointly controlled by kiev and russian traffic controllers.
fourth. just a few hours before the hit, russia supposedly closed the corridor where mh17 was flying. might be a coincidence. but oh how you would trump that up if ukrainians would have done that...
fifth, the only ones who are hiding the evidence are the terrorists on the ground - that includes rocket remains, blackboxes etc. oh well, by now they are being hidden in moscow.