A senior U.S. economic official pressed Japan on Wednesday to demonstrate more of the global financial leadership it shares with the United States to help weather the current crises.

Calling instability in world financial markets "the single most important economic challenge" facing the bilateral partnership, Stuart Eizenstat, U.S. undersecretary of state for economic, business and agricultural affairs, stressed the need for the world's two largest economies to work hand in hand to face the difficulty.

Eizenstat told a Tokyo press conference at the Foreign Correspondents' Club of Japan that the Japanese government should act "swiftly and decisively" to restore its economy not only for the sake of Japan but also for the rest of Asia and other struggling emerging economies.