Japanese Prime Minister Aso said he planned to submit an extra budget for the FY beginning April 1, including a stimulus package to boost the flagging Japanese economy. He told a news conference Tuesday afternoon that the size of the extra budget had not yet been decided. His remarks come as he heads to a G-20 in London on April 2, which will include discussion of measures to boost the global economy, expected to experience its first annual contraction since World War II.