China has urged President Marcos to "read more" so he could "develop a proper understanding of the ins and outs of the Taiwan question."
Mao Ning, China's Foreign Ministry spokesperson, made the pronouncement on Tuesday after the President congratulated Taiwan's President-elect Lai Ching-te on his victory, which Beijing saw as violative of the one-China principle.
Mao suggested that Marcos must do that so he could also "come to a right conclusion."
In her press briefing, the Chinese official said Marcos' remarks "gravely" violated not only the one-China principle, but also the communiqué on the establishment of diplomatic relations between China and the Philippines.
She said the comment seriously went against the Philippines’ political commitments to China, and blatantly interfered in China’s internal affairs.
Meanwhile, in a separate statement, the Chinese Embassy in Manila said Marcos' remark "are at odds with the one-China Principle."
It also contradicted the statement of the Department of Foreign Affairs (DFA), which recently said the Philippines adheres to the one-China principle, thus "sending out erroneous signals to 'Taiwan independence' separatist forces," the embassy added.
Marcos was the only head of state among the 182 countries which has diplomatic relations with China to congratulate Lai, according to the embassy.
"China strongly deplores and firmly opposes this and has immediately lodged strong representations to the Philippine side," Mao said.
"This morning, Assistant Foreign Minister Nong Rong summoned the Philippine Ambassador to China Jaime Florcruz to lodge serious démarche and urge the Philippines to present a responsible response to China," she added.
Amid praises from various countries about the success in upholding the democratic process of the recent Taiwanese polls, Mao said the election result cannot change the dynamics and direction of cross-Strait relations.
It cannot hold back the prevailing trend that China will and must achieve reunification, she added.
She then warned the Philippines to stop "playing with fire on the Taiwan question" and urged the latter to "abide by the-one China principle and the joint communiqué."
Mao also demanded the Philippines to "stop the wrong words and deeds on Taiwan-related issues and stop sending any wrong signal to 'Taiwan independence' separatist forces."
The Chinese embassy added the Philippines must prudently and properly handle the Taiwan-related issues.