For nearly 70 years an imagined line running down the Taiwan Strait between Taiwan and China has helped keep the peace but the so-called median line is looking increasingly meaningless as China's modernised navy asserts its strength.
China has never officially recognised the line that a U.S. general devised in 1954 at the height of Cold War hostility between Communist China and U.S.-backed Taiwan although the People's Liberation Army largely respected it.
