By Ben Blanchard
BEIJING (Reuters) - A widely read Chinese state-run newspaper said on Thursday China should prepare for military action over self-ruled Taiwan, and pressure Washington over cooperation on North Korea, after the United States passed a law to boost ties with Taiwan.
Beijing was infuriated after U.S. President Donald Trump signed legislation last week that encourages the United States to send senior officials to Taiwan to meet Taiwanese counterparts and vice versa.
U.S. Deputy Assistant Secretary of State Alex Wong said in Taipei on Wednesday the United States' commitment to Taiwan has never been stronger and the island is an inspiration to the rest of the Indo-Pacific region.
China claims Taiwan as its own and considers the self-ruled island a wayward province, which Chinese President Xi Jinping said on Tuesday would face the "punishment of history" for any attempt at separatism.
The Global Times said in an editorial China had to "strike back" against the law, for example by pressuring the United States in other areas of bilateral cooperation like over North Korea and Iran.
"The mainland must also prepare itself for a direct military clash in the Taiwan Straits. It needs to make clear that escalation of U.S.-Taiwan official exchanges will bring serious consequences to Taiwan," said the paper, which is published by the ruling Communist Party's official People's Daily.
"This newspaper has suggested that the mainland can send military planes and warships across the Taiwan Straits middle line. This can be implemented gradually depending on the cross-Straits situation," it said.
Underscoring China's concerns, Taiwan's government and the de facto U.S. embassy on the island said a second senior U.S. official would be visiting Taiwan this week, Deputy Assistant Secretary of Commerce for Manufacturing Ian Steff.
In Beijing, foreign ministry spokeswoman Hua Chunying reiterated China's opposition to official contacts between the two, urging people to reread Xi's comments from earlier in the week.
"The Chinese people share a common belief that it is never allowed, and it is absolutely impossible, to separate any inch of our great country's territory from China," Hua said, quoting Xi.
The island is one of China's most sensitive issues and a potential military flashpoint. Underlining that threat, Taiwan sent ships and an aircraft earlier on Wednesday to shadow a Chinese aircraft carrier group through the narrow Taiwan Strait, its defense ministry said.
China's hostility toward Taiwan has risen since the 2016 election of President Tsai Ing-wen, a member of the island's pro-independence Democratic Progressive Party.
China suspects Tsai wants to push for formal independence, which would cross a red line for Communist Party leaders in Beijing, though Tsai has said she wants to maintain the status quo and is committed to ensuring peace.