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Objectivity of the Russian press is in big question, yes. I did not say that I took that article as a complete true. But the same for UK and US press, for sure. BBC recently erased the footage of their correspondent in the "MH17 area" just because it contradicted with the baseline. That's the common problem of all the media.
Mentioning that US new the location of all the Ukrainian resources does not rule out the fact the Russians new them too. And with better resolution, technically speaking. Just because they are closer. And with better knowledge of their own missile and radar capabilities.
When high officials of the Russian DoD were saying (during the open briefing) that some BUKs of the Ukrainian army could reach MH17, I see no reason not to trust them. Because these data are verifiable.
Here is the map they showed:
http://www.mid.ru/bdomp/brp_4.nsf/9f...ElemFormat=jpg
And they were very careful during that briefing, did not blaming anybody directly.