In perhaps the most significant move, the Justice Department is expected to announce the indictments of hackers suspected of working for a Chinese intelligence service and participating in a long-running espionage campaign that targeted U.S. networks.

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Along with that, the administration is planning to declassify intelligence relating to the breaches, which date to 2014, and to impose sanctions on some of those believed responsible, according to people familiar with the plans.

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Other actions are expected, but officials declined to discuss them.

Taken together, the announcements represent a major broadside against China over its mounting aggression against the West and its attempts to displace the United States as the world’s leader in technology, officials said. They are part of an intensifying government-wide approach to confronting China and would come as the two countries have reached a momentary detente in their trade war.

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The actions come amid mounting intelligence showing a sustained Chinese hacking effort devoted to acquiring sophisticated American technologies of all stripes. A number of agencies — including the Justice, State, Treasury and Homeland Security departments — have pushed for a newly aggressive U.S. response. A National Security Council committee coordinated the actions.

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“What’s driving this is not some specific action on the part of the Chinese or a desire to pressure them in the trade talks. It’s the accumulation of intelligence,” said Michael Pillsbury, a China analyst at the Hudson Institute. “It’s really gotten out of hand.”

The White House and the Justice Department declined to comment. Officials at the Treasury Department and the Chinese Embassy in Washington did not respond to requests for comment.

The administration’s planned show of force reflects the limits of a cease-fire agreed upon by President Trump and President Xi Jinping of China on the sidelines of the Group of 20 summit in Buenos Aires this month, as well as Trump’s efforts to blend his national security and trade objectives.

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“The tariff war is a bit of a sideshow to the broader geopolitical competition that is almost inevitably going to heat up,” said Ely Ratner, executive vice president of the Center for a New American Security, a think tank. “There is essentially no overlap between Xi’s vision for China’s rise and what the U.S. would consider an acceptable outcome for Asia.”

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The expected disclosures this week would buttress the government’s contention that China has flouted assertions that it would heed international rules, countering Beijing’s insistence that it does not conduct illegal hacking or engage in illicit transfers of cutting-edge technology.

“Transparency is essential, as is allowing both China and the rest of the world to understand what China is or is not doing,” said Elizabeth Economy, director of Asia studies at the Council on Foreign Relations. “Otherwise we live in a fog of insinuation. . . . People don’t really understand the depth or breadth of the Chinese government’s actions, so this will be an important statement by the administration. This is long overdue.”

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Xi has scrapped China’s traditional deference on the global stage for an assertive stance intended to extend Chinese influence beyond the Asia-Pacific region and into Africa and Latin America.

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The Trump administration wants to dismantle China’s state-led economic model, fearing its heavily subsidized economic giants — armed with stolen or coerced American technology — give Chinese companies an unfair advantage in global markets.

U.S. officials have publicly labeled China an economic predator that seeks advanced American technology. In March, U.S. Trade Representative Robert E. Lighthizer issued a report accusing China of mounting a comprehensive effort to vacuum up U.S. technology through coercive joint-venture licensing rules, corporate acquisitions and cyber­theft.

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Last month, on the eve of the Trump-Xi meeting in Buenos Aires, Lighthizer said that despite repeated U.S. complaints and tariffs on more than $250 billion in Chinese imports, “China fundamentally has not altered its acts, policies and practices related to technology transfer, intellectual property and innovation, and indeed appears to have taken further unreasonable actions in recent months.”

The Trump administration’s new actions against China come in the wake of Canada’s Dec. 1 arrest on a U.S. warrant of a senior executive for a major Chinese telecommunications equipment maker, Huawei Technologies.

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The executive, Meng Wanzhou, was accused of fraud and violating U.S. sanctions against Iran, and U.S. authorities are seeking her extradition.

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The arrest, which sent stocks plunging last week, took place on the same day as Trump’s meeting with Xi and was not coordinated with the White House. Although national security adviser John Bolton was given advance notice, Trump did not learn about it until after his dinner with the Chinese president, administration officials have said.

Administration officials have made clear in recent weeks that even if a deal had been struck at the G-20 summit, that would not deter them from pursuing other actions against China in the national security realm.

The coming indictments are the latest salvo in a major Justice Department initiative launched last month to combat Chinese commercial spying. Since September, federal prosecutors have brought charges in three cases of intellectual-property theft that they say involve Chinese hackers and spies and one involving alleged economic espionage by a Chinese state-owned company.

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The forthcoming indictments involve hackers whom U.S. authorities have connected to the Ministry of State Security, China’s intelligence and security agency, which has in recent years greatly increased its cyber-intrusions into U.S. targets as China’s military has dialed back its activities.

In September 2015, Xi came to Washington and, standing in the Rose Garden alongside President Barack Obama, pledged that his country would not seek to steal trade secrets and intellectual property from U.S. companies to help Chinese industry. And although the military curtailed its commercial hacking in 2016, Beijing’s cyberspies — in particular those affiliated with the MSS — have stepped into the breach, government and industry officials said.

They have filched trade secrets related to semiconductors and jet engines and aircraft carriers. Their targets align with emerging industries that are of strategic interest to Beijing, whose Made in China 2025 initiative aims to make the country the world leader in high-tech manufacturing.

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The 2015 pledge came after news broke that the United States was set to slap sanctions on China for economic espionage and followed the 2014 indictments of five People’s Liberation Army officers accused of hacking major steel manufacturers to purloin trade secrets on behalf of Chinese state-owned enterprises.

In a November speech, Peter Navarro, one of the president’s closest trade advisers, delivered a scathing criticism of Xi’s broken promise.

“Yeah, well, that lasted about six months, and now the U.S. government will tell you unequivocally that those hacks are back up, they’re serious, and they’re coming to get us,” he said at the Center for Strategic and International Studies.

In one campaign dating to 2014 — private-sector analysts dubbed it Operation Cloud Hopper — Chinese operatives hacked several companies that provide cybersecurity services to government agencies and major companies, analysts said. The government was concerned the Chinese could use their access for espionage.

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The indictments expected this week will target these MSS hackers, also known as APT10, said individuals familiar with the matter. The Wall Street Journal first reported the pending indictments, which had been expected for weeks.

The administration’s complaints about China extend well beyond commercial misdeeds.

In an October speech, Vice President Pence laid out a broad indictment of Chinese ambitions, including “Big Brother” surveillance of its citizens and a military buildup aimed at evicting the U.S. Navy from the western Pacific.

Trump and Pence also have accused China of interfering in the midterm elections, though they have yet to outline their evidence. Even as the United States and China prepare for fresh talks aimed at resolving their trade conflict by March 1, the president is pushing ahead to confront Beijing on other fronts. The administration is more closely scrutinizing proposed Chinese investments in the United States and drafting regulations for some of the most sweeping limits on technology exports since the end of the Cold War.