Most Asian currencies fell on Monday, with the Japanese yen coming under pressure from an unscheduled bond buying operation by the Bank of Japan, while the Chinese yuan was hit by weak business activity data.A recovery in the dollar pressured most regional currencies, as the greenback rose from steep losses on Friday. The dollar index and dollar index futures added about 0.2% each in Asian trade.This weighed on most Asian currencies, with the South Korean won losing 0.1%, while the Taiwan dollar shed 0.3%.Weak economic data from China also somewhat dented regional sentiment, although the country is reportedly set to unveil more stimulus measures later in the day. Investing.com