BEIJING -- A Chinese mainland spokesperson on Wednesday urged the United States to stop interfering in China's internal affairs and stop sending wrong signals to separatist forces seeking "Taiwan independence."

Chen Binhua, a spokesperson for the State Council Taiwan Affairs Office, made the remarks in response to the new National Defense Authorization Act that was recently passed by the US Senate, which allocates 1 billion dollars of military aid for Taiwan and seeks to invite the island to participate in a military exercise.

"The Taiwan question is purely China's internal affair and brooks no external interference. We firmly oppose the inclusion of Taiwan-related content in relevant bills of the US Congress, and we firmly oppose any form of military contact between the United States and China's Taiwan," said Chen.

When answering a media query about the inclusion of three US firms on China's unreliable entity list, Chen said these companies, in disregard of strong opposition from China, have engaged in so-called military technology cooperation with Taiwan, seriously undermining China's national sovereignty, security and development interests.

"We firmly oppose such actions and hold these companies accountable in accordance with the law," Chen said.