Japan Boosts Economic Stimulus

The Bank of Japan has increased its economic stimulus, leading to a rise in stock markets and a drop in the yen. Despite this, Japan is unlikely to meet its inflation target. Meanwhile, Russia and Ukraine have agreed on a natural gas export deal, resolving a payment dispute. However, tensions remain as rebels continue attacks in Ukraine. Citigroup is under investigation for its foreign exchange business and is facing significant legal expenses.

What has been the trend of the yen against the dollar following the Bank of Japan's actions?

What financial charge is Citigroup facing due to its foreign exchange business investigation?