Taiwan Strait Tensions — Cross-Strait Conflict Since 1949

Mao Zedong proclaimed the founding of the People's Republic of China on the mainland, while Chiang Kai-shek's Republic of China government retreated to the island of Taiwan (Formosa), along with approximately two million Nationalist refugees and troops. Both governments claimed to be the sole legitimate ruler of all China. The PRC asserted Taiwan was a renegade province to be reunified by force if necessary. The ROC, under martial law, maintained the pretense of governing the whole of China from its provisional capital in Taipei.

The People's Liberation Army began heavy artillery bombardment of the ROC-held offshore islands of Kinmen (Quemoy) and Matsu, sparking the First Taiwan Strait Crisis. The PRC sought to test the U.S. commitment to Taiwan and potentially seize the islands as a precursor to an invasion. In response, the United States and the ROC signed the Mutual Defense Treaty in December 1954, committing the U.S. to defend Taiwan and the Penghu Islands. The crisis subsided after the First Taiwan Strait Crisis ended diplomatically with the ambiguous status of the offshore islands unresolved.

The PLA launched a massive artillery bombardment of Kinmen, firing over 50,000 shells in a single day. The U.S. responded by escorting ROC supply convoys and deploying significant naval forces. The crisis marked the last major direct military confrontation of the Cold War era across the strait. The shelling eventually shifted to an "odd-day" pattern — firing only on alternate days — which continued until 1978. The crisis ultimately reinforced the de facto separation, as neither side pressed for a full invasion or a final resolution.

The United Nations General Assembly adopted Resolution 2758, recognizing the People's Republic of China as "the only legitimate representative of China" to the UN and expelling the Republic of China (Taiwan). Over the following years, most countries switched diplomatic recognition from Taipei to Beijing. Taiwan's international isolation deepened, though it maintained unofficial relations with many nations. Successive U.S. administrations maintained the "One China" policy while continuing arms sales to Taiwan under the Taiwan Relations Act (1979).

In response to Taiwanese President Lee Teng-hui's unofficial visit to the United States — the first by a Taiwanese leader since 1978 — the PRC conducted a series of live-fire missile tests in the Taiwan Strait and military exercises near Taiwan. The tests, which included missiles landing near Taiwan's major ports, triggered a major U.S. naval deployment, including two aircraft carrier battle groups. The crisis marked a turning point: the U.S. visibly demonstrated its commitment to Taiwan's defense, while Beijing intensified its military modernization focused on anti-access/area-denial capabilities.

Tsai Ing-wen of the Democratic Progressive Party won the Taiwanese presidential election, becoming the first female president of Taiwan. The DPP had historically been more inclined toward formal independence than the Kuomintang. Beijing demanded that Tsai accept the 1992 Consensus — a vague understanding that both sides of the strait agree there is "one China" while differing on its definition — as a condition for cross-strait dialogue. Tsai acknowledged the consensus existed but refused to endorse it explicitly, leading Beijing to suspend all official cross-strait communication. Over the following years, China intensified its diplomatic pressure on Taiwan's remaining allies and increased military activities around the island.

U.S. House Speaker Nancy Pelosi visited Taiwan despite strong warnings from Beijing, becoming the highest-ranking U.S. official to visit the island in 25 years. In response, the PLA launched unprecedented large-scale military exercises encircling Taiwan — deploying warships, fighter jets, and ballistic missiles in six zones that effectively simulated a blockade of major Taiwanese ports. The exercises were the largest and closest to Taiwan in modern history. China also announced sanctions on Pelosi and suspended bilateral cooperation on climate, military communication, and other areas with the United States.

Lai Ching-te of the Democratic Progressive Party won the Taiwanese presidential election, continuing the DPP's hold on the presidency. Beijing characterized Lai as a "dangerous separatist" and intensified military activities around Taiwan, including the "Joint Sword 2024A" and "Joint Sword 2024B" exercises simulating blockade, amphibious assault, and strike operations. PLA aircraft and naval vessels crossed the median line of the Taiwan Strait — a de facto buffer zone that had been informally respected for decades — with increasing frequency. By 2024, the annual number of PLA aircraft entering Taiwan's air defense identification zone had grown from fewer than 100 in 2019 to over 2,000.

The PLA conducted "Joint Sword 2024A" exercises, the first to explicitly simulate a multi-domain blockade of Taiwan. The exercises involved the Eastern Theater Command's naval, air, ground, and rocket forces operating simultaneously in five zones around Taiwan. A second round, "Joint Sword 2024B" in October 2024, was even larger. These exercises have become routine, with China signaling it views the use of force as increasingly viable for achieving reunification. The United States, Japan, and other allies have responded with joint patrols, expanded military cooperation with Taiwan, and accelerated arms deliveries, raising the risk of accidental confrontation.

Taiwan signed a contract with the U.S. defense firm Anduril to purchase 2,032 military drones, including 1,554 Altius-700M loitering munitions and 478 Altius-600ISR reconnaissance drones, with deliveries scheduled from late 2026 into 2033. The purchase, one of Taiwan's largest single drone acquisitions, reflected its accelerating shift toward asymmetric, Ukraine-inspired defenses amid sustained Chinese military pressure. Beijing protested the sale ahead of a planned U.S.-China summit, reiterating its opposition to U.S. arms transfers to the island.