Who Really Shot Down Flight MH17 Over Ukraine?

There are many questions:

• What about the Ukrainian fighter jet said by many witnesses — and seemingly confirmed by Russian air traffic controllers — to be shadowing the passenger plane? 
• What about observations from OSCE investigators that the cockpit seemed to have been hit with heavy caliber machine gun fire? 
• Was the Ukrainian fighter using the passenger plane as a “human shield?” Why does the US government seem to have lost interest in the investigation?

Daniel McAdams, Executive Director of the Ron Paul Institute for Peace and Prosperity,  discusses the shoot down on the Scott Horton show, here.