Nearly 18 months after Malaysia Airlines Flight 17 crashed in eastern Ukraine, one of the troubling mysteries is why the U.S. government – after rushing to blame Russia and ethnic Russian rebels – then went silent, effectively obstructing the investigation into 298 deaths, writes Robert Parry.

As the whodunit mystery surrounding the shoot-down of Malaysia Airlines Flight 17 nears the 1½-year mark, the Obama administration could open U.S. intelligence files and help bring justice for the 298 people killed in eastern Ukraine on July 17, 2014.