I'm not sure of anything about the plane. But impacts in the cockpit means frontal impact, wich is quite impossible with a missile guided by infra-red.
Anyway, you should have noticed than all western leaders have accused Russia and Putin since the begining of the story. Without any evidence, of course. Obama can lie, the bad guy will be Putin in our media. At least, we can conclude than western media are not objective.
About dissidence funding in Ukraine. Actualy it's not the CIA job. Of course, they have some contact but they do not "pay" anybody. It works with some NGO like the Soros Fundation (OSF), the NED (led by McCain) and many others. Activists are mainly trained in Serbia via OTPOR. This system is the same for many "colored revolutions", like Tunisia, Georgia etc. or even Hong Kong.
OTPOR logo at Hong Kong
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McCain is the big boss of these operations.
You can see him at Maidan :
McCain is also the guys who negociate less democratic revolutions, like in Syria.
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They actually try to do the same revolution in Russia. That's why Putin wants to forbid and expel some of these NGO.
USAID is known, since a long time, to be a hive of CIA agents. That's why they have been kicked out from Bolivia by Evo Morales.
Here is the way they work : they found a local politician, with some liberal positions, mainly pro-west. They give him many favors, like big amount of money, like "we don't ask you anything, we like your style, so take this money and try to win the next election". Once elected (if so), they come back and say "do you remember us ?".