From Euromaidan Press:

“Russia planned to shoot down an Aeroflot airliner to justify the invasion of Ukraine claims the Security Service of Ukraine (SBU). The SBU head Valentyn Nalyvaichenko reported on the findings at a press conference on Thursday, August 7, reports Ukrainska Pravda.” But they screwed up and hit the Malaysian airliner instead.

More here. This sort of action would not be out of character for someone (cough, Putin) who blew up occupied Russian apartment building to justify war with Chechnya.