The so-called "Taiwan Relations Act" by the United States is completely wrong, illegal and invalid, a Chinese mainland spokeswoman on Wednesday.

Zhu Fenglian, spokeswoman for the Taiwan Affairs Office of the State Council, made the remarks after Laura Rosenberger, the "chairperson of the American Institute in Taiwan", recently visited Taiwan and mentioned that this year marks the 45th anniversary of the "Taiwan Relations Act".

He emphasized the need for the US to ensure that Taiwan has the ability to defend itself and expressed pleasure in seeing Taiwan's actions and investments in strengthening its "defense" capabilities.

Zhu said that the one-China principle is the political foundation and fundamental premise for the establishment and development of diplomatic relations between China and the US.

She said that the so-called "Taiwan Relations Act" seriously violates the one-China principle and the provisions of the three Sino-US joint communiques, and it grossly interferes with China's internal affairs.

She urged the US to fulfill its commitment of not supporting "Taiwan independence" and to cease sending any erroneous signals to the separatist forces of "Taiwan independence".

Zhu also firmly opposed any form of military collusion between the US and Taiwan over a recent proposed military sale of M1A2 tanks between the US and Taiwan.

The Democratic Progressive Party authorities on Taiwan's attempt to seek "independence" by relying on foreign forces is doomed to fail, she said.