Japan remains on high alert over foreign exchange movements, its top currency diplomat Atsushi Mimura said Thursday, following the yen's sharp rise against the U.S. dollar in the day's trading."I'm neither reassured nor satisfied" with the yen's current levels in the currency market, the vice finance minister for international affairs told reporters, adding, "I think we need to stay on high alert."The dollar slipped to the lower 156 yen range in Tokyo after rising above the 160 yen line in recent trading, as market players expect the Bank of Japan to raise its key interest rate at the Sept.…READ FULL ARTICLE