PoliticsMalaysia and China in stand-off near PTTEP's appraisal drillingPotential for escalation in disputed South China Sea watersIn the crosshairs: Borr Drilling's jack-up rig Gunnlod is operating for PTTEP off Sarawak, East MalaysiaPhoto: BORR DRILLINGAmanda BattersbyLondon