Why do US mass media keep silence?

Yeah, I wonder! US ambassador in Ukraine John Herbst announced that entire operation in Crimea was purely peaceful and that those ships brought just civil staff and building materials for improvement of Ukrainian military infrastructure. But for some reason mass media forgot to mention shooters that also were on board and that firstly this landing was made under pretence of NATO maneures. Does anyone in US aware about it? Common Americans even haven't known about unloading of those ships (do they know about those ships at all?)! Of course who would care about something like Crimean peninsula or even joining to NATO of economically backward Ukraine (another excuse for this event)? But also they don't know a single thing about that fact that Ukrainians practically kicked US forces out of Crimea!!! The situation was on the edge of one more military conflict and USA mass media seemingly is sleeping and putting good face on things. Some of American journalists on the BBC air told that he keeps up with succession of Crimean events just by Russian television! How can it be ladies and gentlemen?