The plight of 28 Chinese fishermen who were kidnapped, robbed, stripped and held for 13 days by North Koreans has inflamed Chinese public opinion, with many Internet users taking to microblogging sites to question the Beijing government’s close relationship with its reclusive ally in Pyongyang.

But for the moment, experts and diplomats said, the episode seems unlikely to either shake the alliance or lead Beijing’s Communist authorities to heed Washington’s call to apply more pressure on North Korea to limit its nuclear ambitions.

The fishermen, who were in three boats, were seized May 8 in what the vessels’ owners said were Chinese waters. The Chinese Foreign Ministry did not report the incident for several days.

Since the fishermen’s release Sunday and their subsequent return to the Chinese port of Dalian, emerging details of their captivity have only intensified the public’s indignation. Wang Lijie, the captain of one of the seized boats, said in an interview Wednesday with The Washington Post that five fishermen remained hospitalized, their legs swollen from beatings received during their captivity. He described the captors as North Korean sailors, who gave the fishermen only grain to eat, stripped them to their underwear, beat them repeatedly and drained their boats of fuel before releasing them.

“This is the most horrible memory in my life, Wang said. “They all wore deep-blue military uniforms, and they had a military flag on their boat. They were the North Korean navy.

Wang said that he had encountered North Koreans in the past who were friendly but that this time, “they were even worse than bandits. Noting that Pyongyang “is supposed to be a friend of China’s, he added: “What happened to me this time changed my idea of North Korea completely.

The fishermen’s accounts of mistreatment have also appeared widely in Chinese news media, which describe it as “torture.

Shan Shixian, the owner of one of the boats, said in an interview that the kidnappers initially demanded a ransom of about $65,000 per boat but later just stripped the vessels and the men of everything they had. “They stole about one ton of fish on my boat, a dozen tons of diesel, my boat’s radar, the components, the battery and all the cargo, Shan said. “Everything on the boat was looted.

“I hate North Korea so much, he said. “They not only robbed my fishermen, they tortured them. I’d kill them if I ever met any of them. He added: “They are more like hooligans than the real hooligans. People are all scared.

The sentiments of the captain and the boat owner were echoed even more vociferously on the Twitter-like microblogging site Weibo, which has emerged as China’s sounding board for public opinion. And public opinion has turned decidedly against North Korea, an ally considered so steadfast that Mao Zedong once said the relationship was “as close as lips and teeth.

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