Source and evidence?
“Yushchenko and his cronies....”
CORRECTION. I misspoke and wrote Yushchenko when I actually meant to say Yanukovych.
Yushchenko was apparently poisoned with dioxin in his dinner by the Ukrainian secret police with the possible involvement of Vikto Yanukovyvh and Putin’s intelligence service/s.
Also see the biography of Georgiy Ruslanovich Gongadze.