KIEV, Sept. 7 - President Viktor Yushchenko is expected Thursday to announce a sweeping reshuffling of his team and possibly the government as he seeks a way out of the severe political crisis triggered by corruption allegations.

Yushchenko was likely to dismiss officials, such as Petro Poroshenko, the president's chief security advisor, who have been recently accused of using power for personal financial gain, people familiar with the situation said.