FRANKFURT, March 2 (Reuters) - Germany is investigating an audio recording published in Russian media reported to be a conference call of high-ranking German military officials talking about weapons for Ukraine, sparking concerns of espionage in Germany and calls for clarification from Russia. A German defence ministry spokesperson said on Saturday that it couldn't confirm the authenticity of the recording, but the Federal Office for Military Counterintelligence Service was investigating the matter and all necessary steps would be taken.
The recording can be found here on vk.com. I listened to it and think that it's authentic.
Around 30:00 one of them says: "Imagine the press gets wind of this" 
Edit: The German Ministry of Denfense confirms the authenticity of the recording (Article in germ*n)
in this one are really strong... How can you talk so confidently about something while being totally wrong?
Yes, definitively. I bet that the MAD (Militärischer Abschirmdienst, Military Counter-Intelligence Service) has a very bad day. There is some speculation on why russia made this recording public, because now germ*ny knows that at least one internal communication channel is compromised. But (speculation on my part) one of the call/meeting participants was in Singapur during the call, maybe russia was able to wiretap it because of that?
Word is also that the br*ts are not very pleased about it, because the call leaked that br*tish and american personell is on the ground in ukraine, providing help in equipping planes with western weapons