I heard that Yushenko was likely poisoned on the Kuchma orders by Ukrainian Security Service, although poison itself could come from ex-KGB lab in Moscow, Russia. It might come from Ukraine as well since it was KGB domain as a part of USSR.
The lies have been coming out of the Orange Revolution (OR) from the beginning. Where are the Russian tanks that were coming from the south of Kiev as reported by the OR? Where are the the several hundred Russian spetsnaz who landed in Kiev the OR reported? None of these things happened, but were reported by the OR to discredit the opposition.