Former Kremlin economist Andrei Illarionov has announced he is taking a post with a Washington research institute.

Illarionov has been one of Russian President Vladimir Putin's most prominent critics, particularly about the government's move to restore state control over the energy sector.

Illarionov told the Russian newspaper Kommersant he will not be emigrating to the United States, but will work there nine months of the year as a senior fellow with the Cato Institute's new Center for Global Liberty and Prosperity.

He served as Mr. Putin's economic advisor from 2000 until his resignation late last year. He had already been relieved of some of his duties, including his responsibilities as Russian envoy to the Group of Eight leading industrialized nations.

Illarionov wrote a column for several Russian and Western newspapers earlier this year saying Russia has no place in the Group of Eight. He said the bloc is turning a blind eye to Russian human rights violations and the erosion political freedom in the country.

Some information for this report was provided by AFP and Reuters.