Japanese shares drop ahead of G-20 meeting.

Japanese stocks fell sharply today as the yen travelled in the opposite direction ahead of today's meeting in Moscow of the G-20, whose utterances this week about forex matters have caused all sorts of muddle. Other Asian stocks were fairly flat, while those in Europe have broadly added to yesterday's losses; U.S. stock futures were lower premarket, while the yen was +0.2% vs the dollar