The Philippine navy successfully transported food supplies to marines guarding a disputed shoal in the South China Sea on Tuesday, a week after China’s coast guard used water cannons to force the supply boats to turn back, sparking outrage and warnings from Manila, officials said.

Defense Secretary Delfin Lorenzana said the two wooden boats carrying navy personnel reached the marines stationed on a military ship at Second Thomas Shoal without any major incident. President Rodrigo Duterte expressed disgust on Monday in a regional summit led by Chinese lead Xi Jinping over last week’s Chinese blockade of the supply boats.

However, Mr. Lorenzana said that while the Philippine navy personnel were unloading supplies from the boats, a Chinese coast guard ship deployed a rubber boat with three personnel who took pictures and video of the Filipino forces. I have communicated to the Chinese ambassador that we consider these acts as a form of intimidation and harassment, Mr. Lorenzana said.

He said the resupply boats reached the shoal without a Philippine military escort in accordance with a request by China’s ambassador to Manila, who assured him over the weekend that the boats would not be blocked again.

But a Philippine military plane flew over as the supply boats arrived around noon at the remote shoal, which has been surrounded by Chinese surveillance ships in a years-long territorial standoff.

The Philippines says the shoal is in its internationally recognized exclusive economic zone, but China insists it has sovereignty over the waters and has the right to defend it.