MOSCOW — With the unveiling of his Kremlin Cabinet on Tuesday, President Vladimir Putin made it clear that power will be concentrated in his hands for the next six years and gave no quarter to opposition demands to bring new voices into the highest levels of government.

Putin’s presidential administration will be dominated by the confidants who have surrounded him for a decade, including fellow veterans of the intelligence services.

A handful of highly unpopular ministers were removed from their government posts Monday, suggesting that authorities were heeding recent calls to punish officials for corruption and inefficiency.

But Putin hates to fire people, even if they have become a liability, and he announced Tuesday that each ousted minister would receive a new post as a presidential aide or adviser in the Kremlin.

One who did not receive a Kremlin post was Igor I. Sechin, a former deputy prime minister who has advocated greater state control over the energy sector. Sechin was appointed to lead the country’s largest oil company, Rosneft. Shares in Rosneft rose on the news, which puts a weighty political figure in a position to lobby for the oil sector, which hopes to cut taxes and attract Western partners to explore fields in rugged frontier territory like the Arctic.

Alexei L. Kudrin, a former finance minister and Putin ally who left the government last year, said the new configuration suggested that Putin has moved on from his “tandem’’ with Dmitry Medvedev, the prime minister, and is returning to the highly centralized style of his first two presidential terms.