It is a political mess as well as a tragedy. Malaysia is still dealing with the extra negative press because it's a Malaysian Airlines flight. The plane fell on Ukraine despite it being shot down by pro-Russian separatists and now Putin is juggling the responsibility to the Ukraine because that is where the plane fell.
The plane fell on the pro-russian "independent" part of Ukraine self-proclaimed as Donetsk People's Republic[1]. If the Kiev government wanted to get where the plane fell, as it stands now, it'd have to be a military incursion into enemy territory.