kong meng xiong , 21 , of st. paul , minnesota has been charged with kidnapping , third-degree criminal sexual conduct and false imprisonment .
xiong allegedly tried to kidnap his 15-year-old girlfriend and force her to be his bride in a traditional hmong marriage .
in hmong culture , bride-napping is a frowned-upon tradition in which a male suitor kidnaps his bride if her family does not approve of the marriage .
xiong pleaded guilty to sexual assault against a 13-year-old girl in 2009 when he was 15 .