The Ministry of Defence blamed an unnamed individual’s improper use of a “non-secure data line” for the recent leak of a German army conversation about the Taurus weapon system to Russia. The mistake was made by the participant who took part in the conversation from Singapore and had dialled in via a “non-secure data line” such as a mobile phone or via a wireless network, according to the interim result of an investigation presented on Tuesday by Defence Minister Boris Pistorius. Pistorius ruled out the possibility that a Russian spy had taken part in the conversation without being noticed. “O…