I'd say that most countries would be happy to not have to take back their nationals that have committed violent felonies. For a specific example, Vietnam refus

I'd say that most countries would be happy to not have to take back their nationals that have committed violent felonies. For a specific example, Vietnam refuses to take back their nationals who entered after 12 July 1995. We recently had a case regarding Viet national in the US illegally who, upon serving that sentence, was released among the US public because he had originally entered the US illegally before that 1995 date, and Vietnam refused to allow him back in. He went on to commit another homicide this year.