BEIJING - The Taiwan question belongs to China's internal affairs, and its resolution is a matter for the Chinese people alone, said a mainland spokesperson on Wednesday.

Zhu Fenglian, a spokesperson for the State Council Taiwan Affairs Office, made the comment in response to US President Donald Trump's latest remarks regarding Taiwan in an interview with the New York Times.

"There is but one China in the world and Taiwan is part of China," Zhu said, vowing to firmly safeguard national sovereignty, security and territorial integrity.

READ MORE: Mainland: Resolving Taiwan question brooks no external interference

Concerning recent comments by US media on America's raid on Venezuela and forcible seizure of Venezuelan President Nicolas Maduro and his wife, and these actions' implications for Taiwan, she reiterated that Taiwan is an inalienable part of China and that the Taiwan question is purely China's internal affair.

Resolving the Taiwan question is the Chinese people's own business and is a just cause for safeguarding national sovereignty and territorial integrity, Zhu stressed.

"Outsiders are unreliable," the spokesperson said, noting that the Democratic Progressive Party authorities' attempts to seek "Taiwan independence" by relying on external forces will only turn them into discarded tools of external forces.

In response to a media inquiry about the two individuals newly added to its list of die-hard "Taiwan independence" secessionists, Zhu said the crazier the "Taiwan independence" moves, the tighter the anti-secession noose.

"Taiwan is China's Taiwan," Zhu reiterated, noting that those seeking "Taiwan independence" and undermining cross-Strait relations will be punished by all necessary measures and held accountable for life in accordance with the law.