The East Asia country Taiwan has decided to buy an upgraded version of Lockheed Martin Corp's Patriot surface-to-air missile, the air force said on Wednesday, as the island bolsters its forces to guard against a rising threat from China.

Meanwhile, Chinese-claimed Taiwan has complained of repeated incursions by China's air force in recent months into the island's air defence identification zone, as Beijing seeks to pressure Taipei into accepting its sovereignty.

Taiwan's Air Force told Reuters it had decided to buy the Patriot Advanced Capability 3 (PAC-3) Missile Segment Enhancement (MSE) missiles, with deliveries to start in 2025 and deployment the following year.

The Air Force did not disclose how many missiles Taiwan was planning to buy, citing the sensitivity of the matter. "These purchase plans were made based on the threat from the enemy," an Air Force spokesman told Reuters, adding it will continue to "boost defence capacity".

The spokesman said the Air Force is "cautiously optimistic" about the progress of the purchase. Taiwan's Defence Ministry, in a report to parliament seen by Reuters, said the decision to obtain the newer Patriots was made during a 2019 meeting with the United States during the previous administration of U.S. President Donald Trump.

U.S. President Joe Biden's government has not announced any Taiwan arms sales since taking office in January, though it has pledged its "rock solid" commitment to the democratically-governed island. U.S. arms sales to Taiwan always anger China, which has demanded they stop.

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