I say look in the Dimantina Trench. If you want to commit suicide over the Indian Ocean and not want to be found ditch the plane there.
If the 2 Ukrainians and 1 Russian on board are responsible for this, they succeeded at keeping Putin's invasion of Crimea 2nd billing in the news.. Perhaps their mission was to take this thing to the most remote, deepest waters to prolong search, THUS KEEPING IT IN THE NEWS. Putin would sponsor something like this, given that he knows how knee-jerk our news media is.
Seems like the aircraft was blown out of the sky because that crash signal was never sent from the aircraft!
If the Ukrainians/Russkis didn't do this, the Iranians did! I don't think either pilot was willfully involved in this.