"Welcome Germany! Welcome France! Welcome Italy!" said a commentary in the official Xinhua news agency, describing the United States as "petulant and cynical".
Berlin, Paris and Rome said in a joint statement yesterday that they want "to become founding members of the Asian Infrastructure Investment Bank (AIIB)", after Britain last week announced ambitions to be the first major Western country to join -- drawing a rare rebuke from close ally Washington.
Washington was "trying to forge an anti-AIIB front" among its allies, the commentary said, but "sour grapes over the AIIB makes America look isolated and hypocritical".
"As more and more Western countries mull over joining the China-led lending body, the US will feel lonelier if it continues to be a holdout," it added. "So Washington, what are you waiting for?"
China touts the USD 50 billion institution as a tool for financing regional development alongside other lenders such as the World Bank and the Japan-led, Manila-based Asian Development Bank.