A North Korean lawmaker says three defectors may have been sent back . Kim Jong Un has been fasting to protest China 's policy of sending back defectors . Park Sun-young has threatened to kill three generations of defectors ' families , about 30 says .
A South Korean lawmaker says about 30 defectors may have been sent back . Park Sun-young has been fasting to protest China 's policy of sending back defectors . Kim Jong Un has threatened to kill three generations of defectors ' families , one says .