China's decision to impose sanctions on Japanese House of Representatives member Keiji Furuya for his collusion with "Taiwan independence" separatist forces is a just move based on Chinese law, aimed at safeguarding national interests and consistent with international practice, Zhu Fenglian, a spokeswoman for the Taiwan Affairs Office of the State Council, said in a statement on Monday.

China's Foreign Ministry issued a decision on countermeasures against Furuya early on Monday, stating that he had ignored China's strong opposition, visited Taiwan multiple times, and colluded with "Taiwan independence" separatist forces. The decision took effect immediately.

Zhu stated that the Taiwan question is at the very core of China's core interests and is a red line that must not be crossed. She said Furuya had repeatedly colluded with "Taiwan independence" separatist forces and engaged in provocations, seriously interfering in China's internal affairs and gravely harming China's sovereignty and core interests.

"We firmly oppose this and have taken lawful countermeasures to serve as a warning to others," Zhu said.

She also criticized the Democratic Progressive Party authorities, saying they have sought to cling to external forces for the sake of their own partisan interests and have betrayed the interests of the Chinese nation. Such actions, she said, will be judged by history.