President Biden and his aides came into office with deep knowledge of trans-Atlantic affairs. But over the course of four years, he also focused on the Pacific, where China tends to be the dominant player. Their main effort: construction agreements confrontation with China.

President-elect Donald J. Trump has already shown a different approach to China. He invited Xi Jinping, the Chinese leader, at his inauguration on Monday. The two spoke by phone on Friday, and Xi he is sending China’s vice president, Han Zheng, attended the event, breaking the Chinese tradition of having its ambassador in Washington.

The Biden administration’s latest China-focused projects stand in contrast. Mr. Biden he called Last Sunday with the leaders of Japan and the Philippines to establish a new three security measures he helped build it. Secretary of State Antony J. Blinken he went South Korea and Japan this month in his final tour.

By telling Mr. Biden and his supporters, they are giving Mr. Trump an opportunity to compete with China, the United States’ biggest enemy.

Of all the foreign policies of Mr. Biden, his approach to China can be seen by many experts as being continuous. His administration built their plan on the foundation of competition established by the Trump administration and is now reversing it.

It is unclear what Trump will do about this. He admires Mr. Xi, and sees China primarily through economic negotiations. The billionaire advisers of Mr. Trump, including Elon Muskthey want to maintain and possibly expand doing business with China.

But his top choices because foreign policy aides are closely aligned with Mr. Biden: They to say that the United States must force China through many measures, and use all the security and economic tools.

One early test will be whether Trump imposes a ban on TikTok, a Chinese app popular with young Americans.

Mr. Biden signed bipartisan legislation last year to ban TikTok based on national security concerns unless its parent company, ByteDance, sold it to investors who disagreed with a “foreign adversary.” ByteDance still owns TikTok, and the White House was announced on Friday that it would be up to Trump to enforce the ban. Trump said on Saturday that can provide TikTok a 90-day ban from the ban, and the company’s CEO plans to attend its opening. However, American companies deleted the app from online stores on Saturday night, a few hours before the federal law went into effect.

Trump’s signature on China in his first term was to impose tariffs on some Chinese goods. Mr. Biden and his aides have maintained this while developing a plan along three main areas: strengthening cooperation and creating a new security partnership in the Asia-Pacific; restricting technology in China; and industrialization policy in the United States.

In short, Mr. Biden wanted to transform China’s policies into international policies.

During Mr. Biden’s tenure, the already existing relationship was strained when House Speaker Nancy Pelosi visited Taiwan, an independent island that China claims as its territory, and A Chinese spy balloon he went to the United States. But his team tried to re-establish high-level communication, including between the two armies.

The United States and China are “competing, obviously fiercely competing, but the relationship has a level of stability that right now we’re not about to go down,” Jake Sullivan, a White House national security adviser, said. he said in an interview in the West Wing conference room.

“It’s a big change over four years in how the relationship is managed on both sides,” he added. The Chinese Communist Party, he said, has now agreed to let the Biden team set up a “control race” on the relationship.

The Biden administration was formed by a an idea that China he wants to get rid of the United States as a global power, said Rush Doshi, director of China who worked at the National Security Council earlier in the Biden administration. Many Republican lawmakers and policymakers share that view.

Coming into office, Mr. Biden and his supporters saw great opportunities in difficult areas, including the US defense industry base, Mr. Sullivan said.

The administration established two “big tents” of the policy, as he said: funds intended to restore American manufacturing, technology and supply chains; and businesses in cooperation and partnerships, “to expand the Chinese way into a regional and global way.”

Mr. Sullivan spoke of cooperation not only in Asia, but also in Europe. Mr. Biden’s team helped convince European countries to withdraw from some trade agreements with China, and NATO to speak strongly to China and show that it supports Taiwan.

China’s alliance with Russia during President Vladimir V. Putin’s invasion of Ukraine has helped Europeans get into this, as China has done in cyberespionage.

But the Atlantic allies have not gone as far as the United States in seeing China as a threat. Some European politicians still prioritize trade relations with China, the world’s second largest economy. And Mr. Trump disrupting European countries it could undermine the work of the Biden administration.

In addition, US allies could fall into China’s hands if Trump makes good on his threat to impose global tariffs on them.

Mr. Trump also said that his allies are delaying the US military, and that they have to pay for the United States to defend itself or take care of itself. In Asia, this concept would apply to Japan, South Korea and the Philippines, as well as to Taiwan.

The Biden administration has taken a different view. Creating a web of new security agreements among the allies of the US in Asia, they tried to make their military forces to cooperate with each other and with the United States – which, according to the group of Mr. Biden, it would help deter China.

Mr. Biden also moved strengthening military power about several allies and the presence of the US military in Asia: sending Tomahawk missiles to Japan; working with Britain to begin equipping Australia with nuclear submarine technology, and only submarines; and expand US military access to Philippine territories near Taiwan.

At a private meeting in Washington, Chinese officials complained that it was a ban.

The central question, difficult to answer and important to the Trump team, is whether the Biden administration has struck a balance between deterrence and provocation. Is China accelerating its military, and becoming more aggressive in the region, because of America’s moves behind it?

Beijing found out when Mr. Biden said four times that the US military will protect Taiwan in the event of a Chinese war.

Jessica Chen Weiss, a professor at Johns Hopkins University who worked briefly in the State Department under Mr. Blinken, said that the administration’s policy is that the administration’s policies are not being implemented. management management of management of management of management of management management

He said: “It was able to avoid doing extreme things. “Whether this interference was intended to break the habits that caused it remains to be seen.”

At the summit, Xi directly criticized Biden’s policy, which Chinese officials insist is part of the effort: external controls installed on advanced semiconductor devices, including the type required for the development of artificial intelligence.

After releasing the first episode in 2022, Mr. Sullivan he explained such as the law restricting “basic technologies” from the hands of competitors by establishing a “short court, high fence.”

Some experts oppose the plan you have returned and pushed China to accelerate innovation. And small Chinese companies rely on American technology, the limited influence the United States has in China, he says.

Mr. Sullivan said that the criticism “gets the number of years wrong.”

“Our semiconductor output controls were in line with China’s policy which was clearly and systematically stated to affect their ability to manufacture semiconductors,” he said.

Some former authorities mention other errors. Ryan Hass, the China director on President Barack Obama’s National Security Council, wrote three: Mr. Biden and his team did not have a strong trade policy in Asia, appeared timid in dealing with China, and appeared more open to dealing with high-ranking Democrats on China policy than with developing countries.

But overall, he said, the principle worked: “America is in a stronger position against China than when Biden came into office.”