In the wake of the North Korean famine, which began in 1995, hundreds of thousands of people fled to northeast China. Although many returned and a smaller number went to third countries, many tens of thousands remain. They face two main problems. First is the mistreatment they sometimes receive. China does not recognize them as refugees, or even the legality of their being in the country, so they are forced into an underground existence, making them targets for economic and sexual exploitation.