OVERNIGHT

Reuters reported Turkey downs Russian war plane over airspace violation in Syria and Asian markets shares struggle.

Japan's Nikkei .N225 ended a choppy session with a 0.2 percent gain, after a long weekend. Markets were closed for a national holiday on Monday.

"We're post Japan Inc earnings now and the focus is back on China where local brokers are talking about market reforms, many of which have direct market impacts, which is important because China is a policy-driven market," said Gavin Parry, managing director of Parry International Trading."

There's also a continued focus on the U.S. Federal Reserve, with a lot of sell-side banter about quantifying what level of rate increase brokers are expecting," he said.

Chinese shares wilted, with the blue chip CSI300 index .CSI300 of the largest listed companies in Shanghai and Shenzhen off session lows but still down 0.2 percent, while and the Shanghai Composite Index .SSEC edged down 0.1 percent.

On Monday, Wall Street marked modest losses as Pfizer's (PFE.N) plan to buy Allergan Plc (AGN.N) in a $160 billion deal quickly drew criticism from politicians as a tax dodge.