I mean, the FSB could have easily had an asset inside the refueling operation at the Moscow airport. Place a small time-delayed explosive charge in the fuel intake of the left wing just before take-off, and you'd end up with pretty much exactly the crash profile we've seen.
It's cheaper and more reliable than a missile, leaves less physical evidence behind, and maintains a higher level of plausible deniability. Especially if your fallback plan is to blame it on the Ukrainians if the plot gets discovered.
Source: I watched all 7 seasons of Homeland.
Or you can save yourself a lot of time and hassle and use that money to get an account with a Usenet provider. You still end up downloading everything at full speed over HTTPS, but you don't have to bother with the extra step of waiting for your seedbox to download the torrent.