In the busy waters between China and Taiwan, the de facto border is being tested

Motoring across the calm waters of the South China Sea, Taiwanese captain Lu Wen-shiung recalls the old days, when Chinese and Taiwanese fishers used to meet behind rocky headlands, anchoring their boats out of the authorities' sight, to share a meal. There was less surveillance then, and the two sides were more friendly, fishing the same waters, occasionally selling to each other on the sly. "We were like brothers, we had a good relationship, they would even cook for us," he says. "But ... now the control has become more strict, the [Chinese] coast guard will call me if the…