Taiwan reports Chinese law enforcement vessels near its remote outposts, signaling a potential move by Beijing to assert greater control in the South China Sea.

Taiwan has for the first time reported mainland Chinese law enforcement vessels near an island it controls in the South China Sea, a development experts say could form the basis of Beijing’s effective control in the waters. The move comes after Beijing accused Taiwan’s ruling Democratic Progressive Party of inaction in the face of Japan-Philippines maritime delineation talks, which could concern exclusive economic zones claimed by Beijing and Taipei. Two mainland Chinese law enforcement ships –....