A foreign exchange broker taking a breather is pictured past national flags of Japan and the U.S. (R) at a dealing room in Tokyo August 11, 2011. Japanese Finance Minister Yoshihiko Noda sharpened his warning to currency markets on Thursday in the wake of the yen's rise near record highs against the dollar, keeping markets jittery about the possibility of a second round of intervention. REUTERS/Yuriko Nakao (JAPAN - Tags: POLITICS BUSINESS)