What does the crisis in Ukraine mean for the world's worst nuclear disaster?

Last month marked 28 years since the Chernobyl disaster in Ukraine, the most devastating nuclear accident in history. When construction finishes, the 32,000-ton structure will completely seal off the radioactive debris of a nuclear reactor that exploded on that fateful night in 1986, allowing Ukraine to safely begin the decommissioning process. And as unrest continues to unfurl across Ukraine, hampering an already weak economy, there are fears that cleanup efforts may face further setbacks. \"It's complicated to begin with,\" says Sharon Squassoni, director of the Proliferation Prevention program at the Center for Strategic and International Studies.

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