KYIV. Dec 16 (Interfax-Ukraine) - Ukrainian presidential candidate Viktor Yushchenko thinks the balloting on December 26 may be thwarted by his rival Viktor Yanukovych and incumbent President Leonid Kuchma. "I think we should not say that we have a 100% guarantee of elections on December 26," Yushchenko told a Thursday press conference. "The main task of the Yanukovych team is to do their best to thwart the elections of December 26. I think he is not alone," Yushchenko said. Yushchenko said disruptions are being prepared in eastern Ukraine, as well as "court manipulations" that his rival "is arranging through numerous...