Yushchenko's remarks come as Ukrainian officials discuss ways of reducing the country's reliance on Russian energy following a dispute over natural gas prices.
Ukraine currently gets its nuclear fuel from Russia.
Also today, Yushchenko called for a national referendum on constitutional reforms that forsee expanding parliament's powers.
Meanwhile, Viktor Yanukovich, Ukraine's former premier who lost the disputed "Orange Revolution" election to Yushchenko, today said that he will continue his efforts to regain power in the country.
Yanukovich's remarks came a few days after his party and some other opposition parties in parliament vowed to sack Yushchenko's government.
(AFP, AP, Reuters)