For half a century, Malaysia’s economy has been buoyed by oil and gas, the vast reserves off its shores enabling it to ride out global downturns and sustain growth. Today, these resources are throwing the nation a lifeline once more as global economic waters become ever choppier.But smooth sailing ahead is far from guaranteed. An estimated 3.6 billion barrels of oil and more than 40 trillion cubic feet of natural gas lies under the contested waters of the South China Sea – a maritime expanse...