If you believe some punk rebel drive this Sam battery, set it up, and shot down the plane all by himself without Russian training and assistance then I have a bridge to sell you.
It’s Eastern Europe. Back to late 1980s you had to hit three pop-up targets with a dozen rounds between 100 and 150 yards, one of these in full-auto just to graduate a secondary school and be eligible to high-school or college there. They taught kids how to IED a tank using chemicals and equipment one can find in store or how to aim at moving chopper to hit pilot. Tech students were brought from universities to summer camps and taught how to operate these SAMs including fire drills at drones. Give your neighbor’s mail-order bride AK and she would field-strip it in half-minute blindfolded if she isn’t shy enough to keep her skills secret.
>> Russian training and assistance
Not sure that matters if Russia was not directly involved in the decision to target the plane.