China is stepping up patrols in the waters off the coast of Taiwan’s Kinmen archipelago, days after two of its fishermen drowned while being chased by the Taiwanese coast guard, which accused the boat of trespassing. The Chinese coast guard’s Fujian division will regularly monitor the waters off the southern coast of the city of Xiamen — a few kilometres from Kinmen — to strengthen maritime law enforcement, said the coast guard’s spokesman, Gan Yu, in a statement on Sunday. Fishermen from Taiwan and China regularly sail that stretch of water which has seen a rise in tensions as the number of C…