SEOUL (Reuters) - North Korea sentenced U.S. citizen Kenneth Bae to 15 years hard labor on Thursday for what it said were crimes against the state, a move that will likely see him used as a bargaining chip in talks with Washington. A North Korean defector said Bae will likely serve his sentence in a special facility for foreigners, not in one of the repressive state's forced labor camps. More than 200,000 people are incarcerated in these camps, beaten and starved, sometimes to death, according to human rights bodies. Bae's sentencing comes after two months of saber-rattling by Pyongyang that saw North Korea threaten both the United States and South Korea with nuclear war. Former U.N. ambassador Bill Richardson, who has made numerous trips to North Korea that included efforts to free detained Americans, in a statement said Bae's case should not become entangled in the current U.S.-North Korea impasse. "Now that the sentencing and the North Korean legal process has been completed, it is important that negotiations begin to secure Kenneth Bae's release on humanitarian grounds or a general amnesty," said Richardson, who visited North Korea in January with Google Inc CEO Eric Schmidt. Bae is believed to be a devout Christian, according to human rights activists in South Korea, who say he may have been arrested for taking pictures of starving children, known as "kotjebi," or fluttering swallows. He was part of a group of five tourists who visited the northeastern North Korean city of Rajin in November and has been held since then. Some media reports have identified Bae as the leader of the tour group and NK News, a specialist North Korea news website, said he was the owner of a company called Nation Tours that specialized in tours of north-east North Korea. The reports could not be verified and North Korean state news agency KCNA did not list any specific charge other than crimes against the state, and used a Korean rendering of Bae's name, Pae Jun-ho, when it reported the Supreme Court ruling. According to North Korean law, the punishment for hostile acts against the state is between five and 10 years hard labour. North Korea is one of the most isolated states on earth. Its official policy of "Juche" or self-reliance is a fusion of Marxism, extreme nationalism and self sufficiency centered on the cult of the ruling Kim family. Bae likely will not be incarcerated in one of the North's notorious slave labour camps, such as the one where defector Kwon Hyo-jin was locked up. There, Kwon said, prisoners were worked to death and often survived only by eating rats and snakes. If an American served jail together with North Korean inmates, which won't happen, he could tell them about capitalism or economic developments. That would be the biggest mistake for North Korea," said Kwon, a North Korean sentenced to one of its camps for seven years until 2007. He defected to South Korea in 2009. (Bae) would be sent to a correctional facility that only houses foreigners and was set up as a model for international human rights groups. It was not known if Bae had been taken immediately to jail. Ling, the journalist, told U.S. television that she was placed in a 5-by-6 foot (1.5-by-1.8 meter) cell when captured and then kept in a regular room afterwards. Additional reporting by Christine Kim in Seoul and Paul Eckert in Washington; Editing by David Chance, Raju Gopalakrishnan and Vicki Allen