Asia markets weighed by weak China data, oil price drop

Asian stock markets struggled to post big gains on Tuesday as oil prices fell again and weak Chinese manufacturing data deflated investors' spirits, although stimulus moves by the Chinese central bank tempered the bad news. Worries about China boosted the Japanese yen -- seen as a safe haven in times of turmoil -- which weighed on the Tokyo stock market as the stronger currency threatened exporters' profitability. On Monday, China's central bank cut the proportion of funds banks must set aside a