China said on Friday that its third and newest aircraft carrier, the Fujian, recently sailed through the sensitive Taiwan Strait to carry out "scientific research trials and training missions" in the South China Sea.

Beijing has ploughed billions of dollars into modernising its military in recent years, a trend that has unnerved some governments in East Asia despite China insisting its aims are peaceful.

China has two carriers in operation -- the Liaoning and Shandong -- with the Fujian currently undergoing sea trials.

China's navy said on Friday that undertaking cross-regional trials "is a normal part of the aircraft carrier's construction process".

It is "not directed at any specific target", a spokesman for the Chinese navy, Leng Guowei, said in a statement.

However, its transit th

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