The premiers of Russia and China slammed the U.S. economic system in speeches Wednesday, holding it responsible for the global economic crisis.

Both focused on the role of the U.S. dollar, with China's Premier Wen Jiabao calling for better regulation of major reserve currencies and Russia's Prime Minister Vladimir Putin calling over-reliance on the dollar "dangerous."

Speaking on the opening day of the World Economic Forum in Davos, Switzerland, they both urged more international cooperation to escape the downturn. They also talked up the abilities of their own economies to ride out the recession. Wen said he was "confident" China would hit its 8 percent growth target for this year even though that was "a tall order."

The Russian and Chinese leaders also called for cooperation with President Barack Obama, but it was a chilly reception for the new administration that reflected growing anger in economies that are now getting hit hard by a financial crisis that began with subprime mortgages sold in the U.S.

Putin was characteristically blunt. He called for the development of multiple, regional reserve currencies in addition to the dollar. "Excessive dependence on a single reserve currency is dangerous for the global economy," Putin said.

The Russian leader mocked U.S. businessmen who he said had boasted at last year's Davos meeting of the U.S. economy's fundamental strength and "cloudless" prospects. "Today, investment banks, the pride of Wall Street, have virtually ceased to exist," he said.

Earlier, Wen called for an expansion of regulatory "coverage of the international financial system, with particular emphasis on strengthening the supervision on major reserve currencies."

While Wen never named the U.S., his critique of its failings was as sweeping as Putin's. The financial crisis, he said, was "attributable to inappropriate macroeconomic policies of some economies and their unsustainable model of development characterized by prolonged low savings and high consumption; excessive expansion of financial institutions in blind pursuit of profit" — and other excesses.

"The entire economic growth system, where one regional center prints money without respite and consumes material wealth, while another regional centre manufactures inexpensive goods … has suffered a major setback," Putin said.

Wen's comments came just days after Treasury Secretary Timothy Geithner accused China of manipulating its currency for economic gain. The Chinese premier gently, but firmly warned that if Washington and Beijing chose confrontation, both would be losers.

Click here to read more on this story from the Wall Street Journal.