Taiwan has reported a sharp rise in incursions by Chinese warplanes into its air defence identification zone. Foreign minister Joseph Wu urged Beijing to ‘return to civilised international standards’ after a Chinese foreign ministry spokesman said there was no so-called median line in the Taiwan Strait ‘as Taiwan is an inseparable part of Chinese territory’, to be taken by force if necessary, even though the island has been self-ruled for more than 70 years. Beijing has ratcheted up pressure on the democratic island since the 2016 election of President Tsai who rejects its view that Taiwan is part of ‘one China’. Taiwan accuses China of violating a long-held tacit agreement after China’s fighter jets began crossing the median line of the waters that separate the two sides. Now tension between the two is at its highest in years, with Taiwanese fighter jets scrambling to intercept the Chinese aircraft last week.