How airstrikes by Israel, Turkey and Russia denote a new era in Syrian war

Regional interests remain very much at stake in conflict neither isolated, nor solely Syrian - though often forgotten

Over the plains of northern Syria, an approaching warplane usually makes a distinctive roar, allowing those on the ground to determine who it belongs to and whether there's a need to hide.

But the past few days have been more onerous than ever for plane-spotters as the air forces of three countries have crisscrossed Syrian skies, bombing targets from the Mediterranean coast to the deserts of the east in the most comprehensive airstrikes in the past three years.