The haze billowing out from wildfires in the Indonesian regions of Kalimantan, Papua and Sumatra knows no borders.

Carried by winds to nearby Singapore and Malaysia, the toxic smog has in recent weeks impacted populations across maritime South East Asia, triggering respiratory illnesses and headaches.

It's also giving the region's governments a different kind of headache - split between the mounting frustrations of their citizens and the risk of souring diplomatic ties with Indonesia.

"People are fed up, angry and anxious," Eugene Tan, associate professor of law at the Singapore Management University, tells the BBC.…