Crew members are photographed aboard on Chang Chien frigate of the Taiwanese Navy Force while monitoring the Chinese frigate Ma'anshan of People's Liberation Army Navy, from an undisclosed location on the waters around Taiwan, in this handout picture released on April 8, 2023. The security source said about 20 military ships, half from Taiwan and half from China, were engaged in a stand-off near the Taiwan Strait’s median line, which has for years served as an unofficial barrier between the two sides, but did not behave provocatively. Taiwan’s defense ministry said earlier on Sunday that in the previous 24 hours it had spotted 71 Chinese air force aircraft and nine navy vessels around Taiwan