(Reuters) -An emerging U.S.-Japanese trade deal could unlock major investment, avert a potential shock to the global economy and may deliver political wins for both U.S. President Donald Trump and Japanese Prime Minister Shigeru Ishiba, though many specifics of the agreement remain unclear.

By Tim Kelly, Satoshi Sugiyama and Leika Kihara TOKYO (Reuters) -Japanese Prime Minister Shigeru Ishiba plans to step down following a bruising upper house election defeat, a source told Reuters, as the embattled premier announced a long-sought trade deal with U.