From Sept 2009:
It looks like the alleged poisoning story is far from over. Whether the new findings are true or not, the question that still remains is what really happened to the Ukrainian president and what caused dramatic changes in his appearance.
https://www.rt.com/usa/ukrainian-president-poisoning-falsified/
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According to the May 2012 Sputnik article I cited, Ukrainian prosecutors closed the case because Yushenko refused cooperation with the investigation, declining to submit to new blood tests.