Asian share markets were mixed and oil prices fell on Monday as relief US-led strikes on Syria looked unlikely to escalate was tempered by concerns at Russia's potential reaction to new sanctions from Washington.

With the situation in the Middle East still fluid, moves were modest and in both directions. EMini futures for the S&P 500 nudged up 0.38 percent, while Japan's Nikkei added 0.2 percent.

Yet MSCI's broadest index of Asia-Pacific shares outside Japan slipped 0.4 percent as Chinese blue chips took an early 0.7 percent dip.

The United States, France and Britain launched 105 missiles targeting what the Pentagon said were three chemical weapons facilities in Syria in retaliation for a suspected poison gas attack in Douma on April 7.

"Trump was able to enforce his chemical weapons red line without crossing the threshold for Russian retaliation," analysts at JPMorgan said in a note.

"Stocks were concerned about a prolonged and expanded US campaign towards Assad and that doesn't look probable."

Safe-haven assets eased in response, with yields on US 10-year Treasury debt up two basis points at 2.84 percent.

The dollar was a fraction firmer on the yen at 107.40 , up on last week's low around 106.62.

Dealers were keeping a wary eye on Japanese politics after a survey showed support for Japanese Prime Minister Shinzo Abe had fallen to 26.7 percent, the lowest since he took office in late 2012.

Abe's sliding ratings are raising doubts over whether he can win a third three-year term as ruling Liberal Democratic Party (LDP) leader in a September vote, or whether he might even resign before the party election.

The euro was steady at USD 1.2330, while the dollar index eased a touch to 89.772.

EARNINGS, CHINA GDP ON MENU

In commodity markets, gold gained 0.1 percent to USD 1,346.61 an ounce, but remained well short of last week's peak at USD 1,365.23.

Oil prices slipped with Brent crude futures off 66 cents at USD 71.92 a barrel, while US crude fell 56 cents to USD 66.83 a barrel.

Looking ahead, the US earnings season kicks into high gear this week with Thomson Reuters data predicting profits at S&P 500 companies increased by 18.6 percent in the first quarter from a year ago, their biggest rise in seven years.