In this Oct. 22, 2004 photo, Taiwanese soldiers stand in attention in front of a Patriot missile air defense system near the northern coastal town of Wanli, Taiwan. With the fourth Taiwanese in only 14 months known to have been picked up by authorities on charges of spying for China, it appears that the rival mainland is aggressively targeting high-tech US-made defense systems on the island.  (AP Photo/Wally Santana)
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