Asian shares struck a cautious tone on Tuesday as the double-whammy of a deepening conflict in Iraq and a gas dispute between Ukraine and Russia sapped investors’ appetite for risk. MSCI’s broadest index of Asia-Pacific shares outside Japan fell 0.15 percent. Oil prices remained near nine-month highs as militants from the Islamic State of Iraq and the Levant have seized a large part of northern Iraq, forcing U.S. President Barack Obama to consider options for military action to support Iraq’s besieged government.