Boats at Scarborough Shoal in the South China Sea are shown in this handout photo provided by Planet Labs, and captured on March 12, 2016. The head of U.S. naval operations, Admiral John Richardson said the U.S. military had seen Chinese activity around Scarborough Shoal in the northern part of the Spratly archipelago, about 125 miles (200 km) west of the Philippine base of Subic Bay. REUTERS/Planet Labs/Handout via Reuters

Boats at Scarborough Shoal in the South China Sea are shown in this handout photo provided by Planet Labs, and captured on March 12, 2016. The head of U.S. naval operations, Admiral John Richardson said the U.S. military had seen Chinese activity around Scarborough Shoal in the northern part of the Spratly archipelago, about 125 miles (200 km) west of the Philippine base of Subic Bay. REUTERS/Planet Labs/Handout via Reuters

Boats at Scarborough Shoal in the South China Sea are shown in this handout photo provided by Planet Labs, and captured on March 12, 2016. The head of U.S. naval operations, Admiral John Richardson said the U.S. military had seen Chinese activity around Scarborough Shoal in the northern part of the Spratly archipelago, about 125 miles (200 km) west of the Philippine base of Subic Bay. REUTERS/Planet Labs/Handout via Reuters

June 27, 2016 3:12 PM (UTC+8)