LONDON — Japan got an official go-ahead for its additional stimulus plan at the just-concluded global financial summit in London, as summiteers presented a united front on carrying out stimulus measures to buoy the faltering global economy.

Prime Minister Taro Aso also once again asserted Tokyo's steadfast position as a generous financial contributor to help embattled developing economies hurt by the current economic crisis. He pledged to boost Japan's aid for Asian neighbors and bolster support for trade finance.

Although Japan has limited space for ambitious fiscal spending plans as it is saddled with the heaviest debts among rich countries, Aso brushed aside concerns about fiscal sustainability and declared just before his departure for London that Tokyo will compile fresh stimulus steps by the middle of this month.