Japan's intervention in the currency markets is unlikely to stem the appreciating yen and is largely politically motivated, Japan's former vice minister for finance Eisuke Sakakibara, or "Mr. Yen" as he is widely known, told CNBC on Friday. Bloomberg via Getty Images Sakakibara believes currency intervention needs to be done in conjunction with monetary policy. "The basic cause of the strong yen [JPY=X 78.58 -0.54 (-0.68%) ] is the weakness of the American economy, and the weakness of the dollar," Sakakibara said. "One of the reasons why the dollar is so weak is American monetary authority is implementing very ... (full story)