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3 March 2024

DF-21D: China's Ultimate Weapon to Sink U.S. Navy Aircraft Carriers

Brandon J. Weichert

Summary: The DF-21D missile, part of China's strategic anti-area/access denial (A2/AD) arsenal, represents a pivotal component of Beijing's military posture against US naval power in the Indo-Pacific. Stemming from a long history of prioritizing innovative defense mechanisms, the DF-21D is designed to thwart US military influence near China's borders, particularly concerning Taiwan. China's reliance on a vast ballistic missile arsenal, including the DF-21D, aims to deter US intervention by posing significant threats to US Navy assets, leveraging China's strategic advantages to potentially reshape regional dynamics without direct confrontation, reflecting Beijing's calculated approach to expanding its maritime and territorial influence.

The DF-21D: China’s Ultimate Trump Card Against the US Navy: The People’s Republic of China is vulnerable to US military power. Since the 1960s, Beijing has striven to create radical, advanced technologies designed to rebuff US military power projection. The Dong Feng-21, which was first conceived in the 1960s, was completed by the early 1980s and first deployed by China’s military in 1991.

For Chinese strategists, the idea of preserving the core of China has dominated their great nation’s foreign policy discourse. This is not merely a product of the modern Chinese Communist Party (CCP). This is a key theme repeated throughout their 4,000-year history.

Constantly worried about barbarian invasions, China’s rulers historically strove to outpace these foes technologically and deploy innovative defensive weapons and tactics—including what Taylor Fravel called “Active Defense.” Writing in the Marine Corps Gazette in 2021, Maj. Timothy A. Ornelas reminds readers that China’s war planners describe their “active defense” strategy as, “strategically defensive but operationally offensive.”

The Best Defense is a Strong Offense

China’s behavior, therefore, in pushing its military’s reach into the First Island Chain (and seeking to dominate the second and third island chains) is nothing new. It goes hand-in-hand with China’s ancient behavior of pushing beyond the small collection of ethnically Han villages around the Yellow River basin into wider Eurasia beyond—and why China’s rulers ultimately built their Great Wall which still stands as a testament to China’s obsessive quest for security. The DF-21, as well as its subsequent variants—notably the DF-21D—and all the rest of China’s growing missile arsenal is a new age version of this Great Wall mentality that dominated the minds of China’s rulers for thousands of years.

Whereas historically, China has focused on its western land borders for security, Beijing is today pivoting and attempting to become a more maritime-focused security state. China’s leaders insist that they are merely being defensive. Again, though, we must reference their “active defense” strategy. Yes, they are building up capabilities to effectively shield themselves from what they view as seaborne American aggression.

Beijing, however, seeks to enhance its territorial holdings in the Indo-Pacific as well as to expand its own power projection far beyond its borders. In fact, in 2008, the head of China’s navy ruefully quipped to the then-head of the US Navy that Beijing would take everything to the west of Hawaii and Washington could have everything to its east. Whether the Chinese admiral was being facetious at the time, the fact remains that Beijing’s forces have operated according to this informal design.

DF-21D: Dong Feng Does US Navy In

Today, the Dong Feng model of missiles has become the basis for China’s anti-area/access denial (A2/AD) strategy.

Before China can take to the deep blue seas of the Indo-Pacific, Beijing must first secure what Russia might refer to as its “near-abroad.” Japan, South Korea, Taiwan, Vietnam, India, and the Philippines are but some of China’s neighboring states that could complicate their grand imperial plans. All these countries, on some level, require US military backing to deter China’s more revanchist ideas.

This is especially true of the threatened democracy of Taiwan, which holds a special place in the cold hearts of Beijing’s leaders. For the CCP, Taiwan is little more than a breakaway province in need to being brought to heel by Chinese military power. Once captured, Beijing intends to use Taiwan as a base from whence to launch their aggressive program of dominating the whole Indo-Pacific.

Key to this entire strategy is not China’s growing navy or their massive air force. It’s not even their outsized army. No, the key is their huge—and growing—ballistic missile arsenal. Today, the DF-21’s updated variant, the DF-21D, along with a coterie of other ballistic missiles, can threaten the US Navy’s power projection into regions closer to China’s shores.

Having experienced the humiliation of the Taiwan Strait Crisis in 1995-96, when the Clinton Administration sailed two US Navy aircraft carriers through the Taiwan Strait separating Taiwan from China’s mainland, Beijing vowed to never again be forced to stand down from attacking Taiwan by such a small deployment of US forces (compared to the hulking force that China had arrayed against Taiwan at that time).

Beijing Has Got Washington's Number (and Taipei's)

Recognizing that China’s navy could never hope to match the skill and power of the US Navy, Beijing’s strategists determined to counteract US military superiority in the Indo-Pacific by steadily building up their missile arsenals. Because US warships are so advanced and expensive to maintain (and the Americans no longer possess the mass production capabilities they did in the Second World War), China’s military calculates that the extreme threat that systems, like China’s DF-21D poses to US Navy warships—notably the expensive aircraft carriers—will stay Washington’s hand when China decides to attack Taiwan.

Given the turgid US economic system, its divided domestic political scene, its sclerotic industrial capabilities, the ambivalence of most Americans about world affairs, and financial burden of possibly losing large numbers of US warships to China’s DF-21D and other antiship missile systems, Beijing’s leaders just might be right. The Americans would stay their hands and negotiate with China over Taiwan’s fate.

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