Nobody knows who shot down MH17, but Ukraine is to blame for the catastrophe as it did not close its airspace.
The crash of MH17 cannot be considered an act of terrorism because neither the Dutch Safety Board nor the Joint Investigative Team have arrived at the conclusion the liner was shot down deliberately or that the equipment had been allegedly provided for this particular purpose.
NATO is running a complex propaganda campaign against Russia. It includes several elements, like accusations that Russia interfered in the US elections; intervened in Ukraine and Crimea; threatens German elections and European democracy. An important component of the campaign is the statement about Russian involvement in the MH17 tragedy.