China is continuing its nuclear expansion, is strengthening its ties with Russia, and has increased military pressure against Taiwan over the past year, according to a new Defense Department report that examines actions accelerating key areas of conflict with the U.S.

The report, released Wednesday, also noted that the recent rash of corruption allegations within China’s powerful Central Military Commission, which oversees the People’s Liberation Army, is hurting Beijing’s military growth and could slow its modernization campaign.

A senior defense official said China has made progress in some of its programs but slid back in others. 

The official, who spoke on condition of anonymity to describe the U.S. assessment, warned that Beijing is working toward developing a more diverse and technologically sophisticated nuclear force. While the expected number of nuclear warheads has maintained consistent growth, China is broadening its targeting abilities.

Beijing is going to be able to go after more and different types of targets, do greater damage and have more options for multiple rounds of counterstrikes, the official said. The U.S. is urging China to be more transparent about its nuclear program, while also warning that America will defend its allies and take appropriate steps in response.

According to the report, which provides the annual U.S. assessment of China’s military power and is required by Congress, By mid-2024, China had over 600 operational nuclear warheads, and the Pentagon expects it will have more than 1,000 by 2030. The Pentagon’s estimate of China’s current stock of nuclear warheads is about 100 higher than disclosed in last year’s report, but that is a reflection in the change in the estimate, not the pace of production.

The Biden administration has worked to maintain a balance with China, building up the U.S. military presence in the Asia-Pacific region to be ready to counter Beijing while also encouraging increased communications between the two countries at the diplomatic and military levels.

That uptick in talks has coincided with a decrease in coercive and risky intercepts of U.S. aircraft since late 2023, compared with the previous two years. China still, however, does what the U.S. military considers “unsafe” flights near American and allied forces in the region.

The Pentagon’s national defense strategy is built around the assessment that China poses the greatest security challenge for the U.S., and the threat from Beijing influences how the U.S. military is equipped and organized for the future.

Corruption within the PLA has resulted in the ouster of at least 15 high-ranking officials in a major shakeup of China’s defense establishment.

“This wave of corruption touches every service in the PLA, and it may have shaken Beijing’s confidence,” the report said.

In June, China announced that former Defense Minister Li Shangfu and his predecessor, Wei Fenghe, were expelled from the ruling Communist Party and accused of corruption. Last month, another senior official, Miao Hua, was suspended and put under investigation, according to China’s Defense Ministry.

The U.S. report points to a persistent increased military presence by China around Taiwan, the self-governing island that China claims as its own. It said China’s navy has been in the region more and that there have been increased crossings into the island’s air defense identification zone and major military exercises in the area.

Just last week, a large deployment of Chinese navy and coast guard vessels in the waters around Taiwan triggered alarm as Taiwanese officials said it looked like China was simulating a blockade. Officials have said there were as many as 90 ships involved in what Taiwan described as two walls designed to demonstrate that the waters belong to China.

Taiwan split from communist China in 1949 and has rejected Beijing’s demands that it accept unification. China says it will do so by force if necessary, and leaders have said they want to be ready to do so by 2027.

The United States is obligated under domestic law to help defend Taiwan and give it weapons and technology to deter invasion.

The island democracy has been the chief source of tension between Washington and Beijing for decades and is widely seen as the most likely trigger for a potentially catastrophic U.S.-China war.

More broadly, the report concluded that the PLA continued its drive to develop greater military capabilities but “made uneven progress toward its 2027” milestone for modernization.

One area of expansion, the report said, is with unmanned aerial systems, which officials said are “quickly approaching U.S. standards.”

Regarding Russia, the report said China has supported Russia’s war against Ukraine and sold Russia dual-use items that Moscow’s military industry relies on. Dual use items can be used for both civilian and military purposes.

contributed to this report.