BEIJING -- A Chinese defense spokesperson on Thursday issued a stern warning to the Philippines against offending China's core interest in any form.

Zhang Xiaogang, spokesperson for the Ministry of National Defense, made the remarks at a press conference when asked about Chinese aircraft carrier Shandong's appearance in the waters north of the Philippines during a recent Philippine-US joint exercise, as well as the Philippine Navy spokesperson's claim about potential joint exercises involving Philippine and Taiwan troops.

The Shandong aircraft carrier task group was conducting its annual training mission in relevant waters to further test and enhance the integrated combat capabilities of the carrier task group, Zhang said.

"This is in accordance with international law and common practice, and is not directed at any specific country or target," he said.

Certain individuals in the Philippines are colluding with external forces such as the United States, to "stir up the sea" for selfish gains, undermining peace and stability in the South China Sea region. They even attempt to play with fire on the Taiwan question, the spokesperson said.

"We sternly warn the Philippine side to cease its infringements and provocations, and stop offending China's core interest in any form," Zhang said, adding that China will continue to take resolute and forceful measures to defend its territorial sovereignty and maritime rights and interests.