Watch WSJ’s exclusive access to a Taiwanese Coast Guard patrol as it counters China’s ‘gray zone’ pressure in the Taiwan Strait Photo: Javier Manzano for The Wall Street Journal The Taiwan Strait is now a crowded front line. Increasing encounters between Chinese and Taiwanese vessels have transformed one of the world’s busiest shipping lanes into a tinderbox. China’s growing aggression is forcing a fundamental shift for the Taiwanese Coast Guard.