text: Japan Maritime Self-Defense Force's PC3 surveillance plane flies around the disputed islands in the East China Sea, known as the Senkaku isles in Japan and Diaoyu in China, October 13, 2011. China's Foreign Ministry said it would continue to take "necessary measures" to safeguard its sovereignty over a number of disputed islands in the East China Sea after Japan said it was considering a plan to "buy" them from private landowners. Picture taken October 13, 2011.