U.S. warships on Sunday cruised by disputed islands in the South China Sea in a planned exercise, Reuters reported.

China currently asserts its right to the islands.

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“We conduct routine and regular Freedom of Navigation Operations (FONOPs), as we have done in the past and will continue to do in the future,” said the United States Pacific Fleet, according to the news service.

It noted that the exercise comes as the United States pursues negotiations with North Korea over its nuclear program, for which the Trump administration has sought China’s help.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE last week canceled the planned June 12 summit with North Korea’s Kim Jong Un. But Trump said Friday that U.S. officials were still working toward the June 12 meeting.

“We are having very productive talks with North Korea about reinstating the Summit which, if it does happen, will likely remain in Singapore on the same date, June 12th., and, if necessary, will be extended beyond that date,” the president wrote on Twitter.

South Korean President Moon Jae-in said Sunday that Kim is dedicated to the planned meeting with Trump and to dismantling Pyongyang's nuclear weapons program.