The newly interventionist stance by the Japanese government of prime minister Shinzo Abe, overtly pressuring the Bank of Japan to loosen its monetary policy, has seen the yen weaken considerably against the dollar.

CNN: US Treasury triggers fall in yen

The policies have seen Japan's central bank, the Bank of Japan, double its inflation target to 2% in attempt to spur domestic consumption.

BBC: Japan shares up as G20 statement stokes weak yen hopes

Japan's Nikkei Stock Average climbed 2% to the highest level seen since July 2008 as markets reacted to the Bank of Japan's new aggressive efforts to ease monetary policy.

WSJ: Stocks Notch Another Record