China ramped up its pressure on democratic Taiwan over the weekend, with an unusually large number of fighter jets approaching the island in a "test" for the new administration of US President Joe Biden. On Sunday, 12 Chinese fighter jets entered Taiwan’s air defence identification zone, along with a reconnaissance aircraft and two anti-submarine aircraft, Taiwan’s defence ministry said. A day earlier, China sent eight bomber planes capable of carrying nuclear weapons and four fighter jets to the same area to the southwest of the island, as well as one reconnaissance aircraft. On both occasions, Taiwan sent up aircraft, issued radio warnings to the Chinese aircraft, and deployed air defence missile systems to monitor their activity. Beijing claims self-governing Taiwan as part of its territory, and has been angered by a show of increased US support for Taiwan during Donald Trump’s administration. In recent months, China has carried out frequent, at times daily, incursions aimed at pressuring President Tsai Ing-wen’s government to accept Beijing’s demand that it recognise Taiwan as part of China. These incursions have usually consisted of just one or two reconnaissance planes in recent weeks, rather than the warplanes seen over the weekend.