She stresses that the U.S. assessment of the situation had been clear from the outset - MH-17 was shot down by anti-aircraft surface-to-air missile from the East Ukraine territory which at the time was controlled by the separatists.
She stressed the United States was certain that there had been no Ukrainian air defense systems in the area, and that Ukrainian forces had not launched a single Buk missile during the conflict.
Harf noted that Russia's statements constantly change: "First they said it wasn't a BUK missile. Now, suddenly, they're saying it is, but it wasn't them."
"So I just think the credibility is not 100 percent here on that," the spokesperson said.
Boeing 777-200 of the Malaysian Airlines, flight MH17 Amsterdam (Netherlands) - Kuala Lumpur (Malaysia) crashed July 17, 2014 near Hrabove village in the Donbas, in the territory controlled by the pro-Russian militants. There were 298 people on board, all of them died. There were 196 citizens of the Netherlands, 44 Malaysian citizen (including 15 crew members), and 27 Australian citizens. Among the victims were also citizens of Indonesia, Germany, Belgium, the Philippines, UK, Canada and New Zealand.
According to preliminary findings of the international investigation, the cause of the crash was external influence on the airliner. The most common version is that the plane crashed after being hit by a rocket launched from an anti-aircraft missile systems Buk, which came from Russia.