President Xi Jinping declared China’s "great rejuvenation" unstoppable on Wednesday as he used the country’s largest-ever military parade to hint at reunification with Taiwan and to flaunt advanced weapons designed to rival American power.

Xi said the People’s Liberation Army would "resolutely safeguard national sovereignty, unity and territorial integrity," underscoring Beijing’s ambitions toward Taiwan. "The great rejuvenation of the Chinese nation is unstoppable," he added.

The 70-minute spectacle marked the 80th anniversary of Japan’s surrender in World War II. Thousands of troops goose-stepped through Tiananmen Square, followed by columns of tanks, missile carriers and drones.

Xi has repeatedly set 2027, the 100th anniversary of the PLA, as a deadline for military modernization — a timeline U.S. officials warn could coincide with preparations for an invasion of Taiwan.

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China showed off its full nuclear triad — missiles launched from land, sea and air. That included the DF-41 intercontinental ballistic missile, capable of traveling 12,400 miles, putting the U.S. mainland within range.

Analysts paid special attention to what appeared to be a new DF-61 hypersonic missile carried on a WS2400 truck. The weapon is believed to be designed to outpace U.S. missile defenses. Submarine-launched ballistic missiles and long-range bombers rounded out the display of nuclear muscle.

The PLA also rolled out stealth drones — like the GJ-11 "Sharp Sword" UCAV and other ‘loyal wingman’ drones — alongside AI-enhanced tanks, hypersonic weapons, underwater drones and other futuristic systems.

Amphibious assault vehicles hinted at preparations for a Taiwan contingency. Beijing also highlighted cyber and space capabilities, signaling ambitions beyond conventional battlefields.

Xi watched the procession flanked by Russian President Vladimir Putin and North Korean leader Kim Jong Un — a not-so-subtle signal of solidarity among America’s adversaries.

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After the parade, Putin and Kim met behind closed doors for two hours. Putin thanked Kim for supporting Russia’s war in Ukraine, Chinese state media reported.

President Donald Trump weighed in on Truth Social, addressing Xi directly: "Please give my warmest regards to Vladimir Putin, and Kim Jong Un, as you conspire against The United States of America."

Around two dozen world leaders watched from the stands, including Iranian President Masoud Pezeshkian. Only two heads of state from Europe — Serbian President Aleksandar Vucic and Slovak Prime Minister Robert Fico — accepted China’s invitation, as Western allies largely stayed away.

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Taiwanese President Lai Ching-te dismissed the spectacle as "psychological intimidation." 

The show of force came just months after the U.S. staged its own military parade in Washington to mark the Army’s 250th birthday, in a signal that China intends to match and eventually surpass American military power.

More than 1,000 current and former employees of the Department of Health and Human Services (HHS) signed a letter calling on HHS Secretary Robert F. Kennedy Jr. to resign on Wednesday.

The employees cited Kennedy's recent ousting of the Centers for Disease Control and Prevention (CDC) director Susan Monarez. They also accused Kennedy of appointing "political ideologues" to positions of authority.

"We believe health policy should be based in strong, evidence-based principles rather than partisan politics. But under Secretary Kennedy’s leadership, HHS policies are placing the health of all Americans at risk, regardless of their politics," the letter says.

"Should he decline to resign, we call upon the President and U.S. Congress to appoint a new Secretary of Health and Human Services, one whose qualifications and experience ensure that health policy is informed by independent and unbiased peer-reviewed science. We expect those in leadership to act when the health of Americans is at stake," the letter continues.

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HHS did not immediately respond to a request for comment from Fox News Digital.

The letter comes just days after Sen. Bernie Sanders, I-Vt., also called on Kennedy to resign, citing his actions at the CDC. The Trump administration announced the removal of Monarez last week, less than a month after she was confirmed, after she refused Kennedy's directives to adopt new limitations on the availability of some vaccines, including for approvals for COVID-19 vaccines.

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Four other senior CDC officials resigned in protest after Monarez's ouster, pointing, in part, to anti-vaccine policies pushed by Kennedy. Hundreds of workers at the agency also walked out of the CDC's headquarters in Atlanta in support of their former colleagues.

Sanders wrote in an op-ed for The New York Times that Kennedy is "endangering the health of the American people now and into the future," and accused the secretary of firing Monarez because she refused "to act as a rubber stamp for his dangerous policies."

"Despite the overwhelming opposition of the medical community, Secretary Kennedy has continued his longstanding crusade against vaccines and his advocacy of conspiracy theories that have been rejected repeatedly by scientific experts," Sanders wrote.

"It is absurd to have to say this in 2025, but vaccines are safe and effective," he added. "That, of course, is not just my view. Far more important, it is the overwhelming consensus of the medical and scientific communities."

The Trump administration has defended Monarez's ouster, with White House press secretary Karoline Leavitt saying Thursday that the president has the "authority to fire those who are not aligned with his mission."

"The president and Secretary Kennedy are committed to restoring trust and transparency and credibility to the CDC by ensuring their leadership and their decisions are more public-facing, more accountable, strengthening our public health system and restoring it to its core mission of protecting Americans from communicable diseases, investing in innovation to prevent, detect and respond to future threats," Leavitt told reporters.

Fox News' Landon Mion contributed to this report