The changes are expected to be discussed in today parliament session that comes as Ukraine's political crisis wades through a stalemate. Protesters are refusing to leave their encampment in downtown Kiev or vacate buildings they occupy, but radicals who clashed violently with police last month are holding to an uneasy truce.
Opposition leader Arseniy Yatsenyuk today said constitutional change would "cancel the dictatorial powers of the president and transfer the right of governing the country to the Ukrainian people."
Another protest leader, Oleh Tyahnybok, said today that the opposition also will push in parliament for a blanket amnesty for more than 100 people arrested in the protests.
Parliament last week offered amnesty to some on the condition that protesters leave many of the buildings they occupy, but the opposition disdained that move, saying authorities were essentially using the arrested as hostages.
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Protesters are also demanding President Viktor Yanukovych's resignation and early elections. Yanukovych, who returned to work today after a brief sick leave, has shown no sign of accepting either of those demands. In addition, the issue that set off the protests remains: Yanukovych's shelving in November of an agreement to deepen Ukraine's ties with the European Union.
Yanukovych backed off the EU deal because of concerns that the bloc was not offering a sufficient cushion for the trade that Ukraine would likely lose with Russia, which wants the country to be part of a Moscow-led trade alliance.