The yen soared against the U.S. dollar Thursday and Tokyo's Nikkei index plunged more than 3 percent after the Bank of Japan (BOJ) shocked markets by not ramping up its stimulus.
Apple's suppliers were among the big losers in Asian markets Wednesday after it announced the first fall in iPhone sales, while overall trading was tentative before a Federal Reserve announcement later in the day.
Asian markets mostly dipped Tuesday on investor caution before Federal Reserve and Bank of Japan policy meetings later in the week, while oil prices rallied after the previous day's sharp losses.
Asian markets sank again Monday after losses on Wall Street and in Europe, with oil prices down and the yen recovering some of the losses suffered at the end of last week.
Asian stock markets mostly retreated on profit-taking Friday, tracing losses in New York and Europe, although crude prices rallied again on fresh hopes for a deal to limit output.
Asian stock markets rallied again Thursday as another surge in oil prices and gains on Wall Street reinforced optimism about the world economy.
Asian shares mostly fell Wednesday, led by sharp losses in Shanghai, as oil prices took a hit from news that a crude workers strike in key producer Kuwait had finished after three days.
Tokyo led a recovery in Asian stock markets Tuesday, soaring more than three percent as dealers built on a strong lead from Wall Street and disappointment over failed oil talks gave way to hope for the global economy.
Major Asian stock benchmarks sank Monday after an effort by major oil producing nations to agree on production cuts failed over the weekend.
Asian stock markets rallied for a second straight session Thursday, tracking gains in New York where traders cheered surprisingly upbeat earnings from Wall Street titan JPMorgan Chase.