俄罗斯囚犯瓦迪姆·克拉西科夫在德国因谋杀罪被判处无期徒刑，如今已被遣送回俄罗斯。克拉西科夫在囚犯交换中扮演了关键角色，俄罗斯为何如此渴望将他带回国？
Vadim Krasikov, who was serving a life sentence for murder in Germany, has been repatriated to Russia. A key figure in the prisoner exchange, who is he, and why did Russia want him back?
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