I can asnwer RT's question 1 straight away: Ukraine immediately blamed separatists because on 17 July they have been celebrating shooting down of an airplane using "Buk" missile. Just go to Google and search for
Украина Торез Сбит транспортный АН 26 and you will find dozens of Russian (!) news on "An-26 shot down by separatists using a missile" published just 30 mins before it became evident it was MH17...