President Viktor Yushchenko was summoned for questioning Tuesday into his nearly lethal poisoning four years ago, and he said the ongoing investigation would produce some “very unpleasant” surprises.

Yushchenko fell gravely ill during the 2004 presidential campaign while he was a leading opposition candidate. He was later diagnosed with a massive dioxin poisoning, which disfigured his face.

Yushchenko has claimed he knows who organized the crime, though he refuses to provide more detailed information.

“We should wait until the investigation is over,” he told reporters before being questioned. “I am convinced that based on the materials the prosecutor's office possesses we will get a lot of new reasons that will surprise citizens.”

 “There will be very unpleasant things for specific people who, it seemed, defended Ukraine's national interests or were supposed to defend them,” Yushchenko said.

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