Obama's remarks and statements by Pentagon officials and the US ambassador at the UN seemed a coordinated effort to use the Malaysia jet tragedy as a means to pressure Russia to end the strife in Ukraine.
Hamas this week showed it has drones at its disposal, forcing Israel to use a Patriot missile to shoot down one that had entered its airspace. Its drones are low-tech, but they have the attention of US defense analysts.
Some defense experts say it's likely Russia has provided Ukrainian rebels with surface-to-air weapons capable of taking down the Malaysian passenger plane. Pentagon officials say they cannot confirm that.