The Japanese yen tumbled today, posting the biggest decline in more than two years, as the nations of the Group of Seven announced that they will jointly intervene in the foreign-exchange markets.

The Canadian dollar gained today as commodities, including crude oil, the main export of Canada, rallied amid the speculation that the global recovery is accelerating.

The Swiss franc fluctuated today after jumped on the previous trading session and fell at the beginning of today’s session, while the Swiss central bank left its benchmark interest rate unchanged.

The Malaysian ringgit weakened today as the nuclear crisis in Japan caused worries that the global economic recovery will slow, reducing appeal of assets of the Asian countries.

The Canadian dollar fell against the euro as risk aversion, that followed the earthquake, the tsunami and the radiation leak from the nuclear plant, decreased appeal of currencies linked to growth. The currency pared losses versus its US counterpart, rising today after falling for two day.

The euro slipped today after Moody’s cut the debt rating of Portugal, increasing concerns about the financial crisis in the European Union.

The Norwegian krone rose today on the speculation that the policy makers will speak about increasing of the interest rates at today’s meeting.

The Canadian dollar weakened as the disaster in Japan cut prices for crude oil and other raw materials and damped demand for currencies linked to economic growth, including the loonie.

The US dollar paired its gains versus the euro and fell against other major currencies as the Federal Reserve decided to keep the interest rates at the record low level and to maintain its assets purchasing program.

The South African rand slumped today as the earthquake, tsunami and the radiation leak from the damaged nuclear plant in Japan decreased investors’ willingness to risk and curbed appeal of higher-yielding currencies.