KYIV. Sept 1 (Interfax) - The Radical Party faction secedes from the parliament coalition and joins the opposition ranks, leader of the Radical Party and its parliament faction Oleh Lyashko has said.

"On behalf of the Radical Party faction, I am announcing our decision to withdraw from the coalition," Lyashko told reporters after a parliament sitting on Tuesday.

He said the party would be in opposition to the incumbent authorities which, in his opinion, united with the Opposition Bloc and 'members of oligarchic groups' during the first reading of decentralization amendments to the Ukrainian constitution.

In addition, Lyashko said they had decided that heads of parliament committees nominated by the Radical Party would resign.

Commenting on this decision, he said that as a result of the activities of the current parliamentary coalition the country is effectively seeing "revenge of Yanukovych's rule."

"Effectively, we are having a new coalition in parliament," he said.

The Radical Party leader recalled that in the year and a half since the protests in Kyiv's Independence Square (Maidan) in February 2013, no one in Ukraine has yet been held accountable for the protestors' deaths.

"Those who killed our brothers on Maidan are today sitting in the Verkhovna Rada, covering themselves up with a parliamentary mandate, and instead of answering [before the law] they have effectively created a new [broad coalition]," Lyashko said.

He said that his party will be the "Ukrainian opposition," unlike the Opposition Bloc, which on August 31 voted for the constitutional changes.

"The faction has made a decision regarding the heads of three committees of the Verkhovna Rada delegated to those positions by the Radical Party. Those heads of parliament committees are tendering their resignations," he said.

Radical Party member Valeriy Voshchevskyi refused to hold the position of deputy prime minister for infrastructure in the Arseniy Yatsenyuk Cabinet.

"The Radical Party faction's decision to secede from the coalition has been unanimous [