WASHINGTON — As public evidence mounts that the Chinese military is responsible for stealing massive amounts of U.S. government data and corporate trade secrets, the Obama administration is poised to spell out specific trade actions it may take against Beijing or any other country guilty of cyberespionage.

According to officials familiar with the plans, the White House is eyeing fines, penalties and other trade restrictions as initial, more-aggressive steps the U.S. would take in response to what top officials say has been an unrelenting campaign of cyberstealing linked to the Chinese government. The new strategy is to be released today, said the officials, who spoke on condition of anonymity.

The White House plans come after a Virginia-based cybersecurity firm released a torrent of details Monday that tied a secret Chinese military unit in Shanghai to years of cyberattacks against U.S. companies. After analyzing breaches that compromised more than 140 companies, Mandiant has concluded that they can be linked to People’s Liberation Army’s Unit 61398.

Military experts believe the unit is part of the People’s Liberation Army’s cyber-command, which is under the direct authority of the General Staff Department, China’s version of the Joint Chiefs of Staff. As such, its activities would be likely to be authorized at the highest levels of China’s military.

The release of Mandiant’s report, complete with details on three of the alleged hackers and photographs of one of the military unit’s buildings in Shanghai, makes public what U.S. authorities have said less publicly for years. But it also increases the pressure on the U.S. to take more forceful action against the Chinese for what experts say has been years of systematic espionage.

“If the Chinese government flew planes into our airspace, our planes would escort them away. If it happened two, three or four times, the president would be on the phone and there would be threats of retaliation,” said former FBI executive assistant director Shawn Henry. “This is happening thousands of times a day. There needs to be some definition of where the red line is and what the repercussions would be.”

The Chinese government, meanwhile, has denied involvement in the cyber-attacks tracked by Mandiant. Instead, the Foreign Ministry said that China, too, is a victim of hacking, some of it traced to the U.S.

Foreign Ministry spokesman Hong Lei cited a report that said in 2012 alone that foreign hackers used viruses and other malicious software to seize control of 1,400 computers in China and 38,000 websites.