  I think the best chance of success is...that experts around the world drop everything they are doing to work on this problem, and have Russia either lead the containment effort or consult with them closely. They have the most experience, they have decades of data. They took their accident seriously and made a Herculean effort to contain it.  Of course we also know the Chernobyl accident was wrought with deception and lies as well, and some of that continues to this day, especially in terms of the ongoing health effects of children in the region, and monstrous birth defects. Unfortunately there is no one better qualified to deal with this than the Russians, despite their own shortcomings. Gorbachev tried to make up for his part in the cover-up of Chernobyl by opening orphanages throughout the region to deal with the affected children.  