CANBERRA, Australia — Australia and New Zealand warned China on Tuesday against building any military base in the South Pacific, following media reports that the Chinese have proposed a permanent stronghold in Vanuatu. Fairfax Media reported that China had approached the former French colony about building a permanent military presence in the South Pacific. China and Vanuatu denied the reports. Australian Prime Minister Malcolm Turnbull said Vanuatu also assured his government that “no such request has been made” by China. “We would view with great concern the establishment of any foreign military bases in those Pacific island countries and neighbors...