The Philippines' Foreign Secretary Alan Peter Cayetano said on Monday that China had been notified of “red lines,” or actions Manila would find unacceptable, in the South China Sea, AP reported. The actions include construction activities on a disputed shoal and extraction of oil and gas in disputed waters. Cayetano provided more details of what President Rodrigo Duterte’s administration has been doing to defend the country’s sovereignty in the disputed region amid criticism that it has been too soft on China, AP reported. Cayetano said the Department of Foreign Affairs has not fallen short in its diplomatic actions toward China.