Russian fighter jets launched from a new airbase in Syria have persuaded western critics to mute their demands for the removal of President Bashar al-Assad, but another group of his opponents sees Moscow’s intervention as more provocative than decisive. Regional powers have quietly, but effectively, channelled funds, weapons and other support to rebel groups making the biggest inroads against the forces from Damascus. In doing so, they are investing heavily in a conflict which they see as part of a wider regional struggle for influence with bitter rival Iran. In a week when Russia made dozens of bombing raids, those...