The Chinese Hong Kong based South China Morning Post, April 12, 2018 reportsin part.
Chinese navy stages double show of strength as US strike group drills in disputed South China Sea -
PLA puts aircraft carrier and submarines through their paces as USS Theodore Roosevelt passes through contested waterway.
The Chinese navy began a three-day drill yesterday near its main submarine base [at Yulin, Hainan Island/Province] as another exercise finished nearby in what analysts described as a message to the United States that it was capable of defending its core interests...”