A file of documents relating to the defection of the Soviet Lieutenant Colonel Jason Davidovich Tasoev from Bremen, and his return to Berlin during the early stages of the Cold War. Subjects discussed in the file include the details of the colonel’s defection during a meeting with another defector, Colonel Tokaev, in Bremen; arrangements for the accommodation of Tosaev; a report summarising his former life and career; a list of questions to be put to him during interrogation; Tosaev’s decision to leave the West and return to the Soviet Union; arrangements for his repatriation, including announcements to the press; and questions asked in the British House of Commons about the defection case.