Duterte, however, warned that he would invoke a July 12 arbitration ruling that invalidated China's territorial claims in the South China Sea if the Chinese "start to tinker with the entitlement," apparently meaning when Beijing starts to tap the offshore area's resources.
"We cannot stop China from doing his thing, the Americans were not able to stop it," Duterte said in a news conference at the airport in southern Davao city before flying to Myanmar.
"I can, but we'll all lose our military and policemen tomorrow, and we are a destroyed nation."
Duterte's remarks differed slightly from those of the Department of Foreign Affairs, which said that it was trying to verify the news reports about China's construction plans on Scarborough Shoal and that it would refrain from commenting while doing so.
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In the past, the Philippine government routinely filed protests or expressed its concern whenever China took aggressive actions to assert its sovereignty in contested territories, but Duterte did not mention any planned protest.
The preparatory work on Scarborough and on five other islands in the Paracel island group off Vietnam were among the government's top priorities for 2017, Sansha Communist Party Secretary Xiao Jie was quoted as saying in an interview published in the paper's Monday edition and seen online Friday in Beijing. No other details were provided.
If the construction plans on Scarborough proceed, it would be China's first permanent structure in recent memory on a shoal that has been at the heart of a territorial dispute with China and would likely reignite concerns over Beijing's increasingly assertive actions to cement its claims in the crucial waterway, where an estimated USD 5 trillion in global trade passes each year.
Chinese government ships took control of Scarborough in 2012 after a tense standoff with Philippine vessels. China then blocked Filipinos from fishing in the shoal, which has a vast, coral-encircled lagoon that also serves as a storm shelter for Asian fishermen.
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