Vienna doctors confirmed that Ukrainian Presidential candidate Viktor Yushchenko was poisoned in September in an attempt to assassinate him. The poisoning was victim-specific -- that is, it could only be administered to one person at a time. British toxicologists have finished tests on the blood samples taken from Yushchenko while he was hospitalized in Vienna.
The poisoning caused his "liver, pancreas and intestines [to become] swollen and his digestive tract [to become] covered in ulcers." It also caused chloracne -- a nasty skin condition consistent with dioxin poisoning. Click the link in the title see pre- and post-poisoning photos of Yushchenko.
Who attempted the poisoning? Take your pick from these options: Pres. Leonid Kuchma's allies, Yanukovych's allies, Ukrainian oligarch allies, the Kremlin. The most frequently made connection is that Yushchenko began feeling symptoms of the poisoning shortly after a dinner with the head of Ukraine's secret service in early September.