No, the latest of their intelligence reports says the missile was fired from an area in East Ukraine held by the separatists but they have found nothing that links the Russians directly.
If you are going to impose a punishment on a country then i don't think hearsay, or what folk 'think' probably went on is grounds to do so. There needs to be some kind of definitive proof, the kind that you would need to present in a court of law.
If there is nothing to link Russia to the murders of the passengers on MH17 then there is no case. The EU could return to its train of thought about some half hearted watery sanctions they were mulling over because of Russian actions prior to MH17. The truth, the blunt truth is that no one really cared that much about Ukraine prior to this event. Not enough to really hurt Russia. Too much gas going to Germany.