Shouldn't the person who planned the murder be prosecuted?
These are matters of discretion. We cannot take the risk of letting things play out as far as murders just because we need to collect evidence.
The priority is to prevent things and remain in control of the situation. Every criminal will be brought to justice eventually.
So basically your men approached the potential murdered on the street and told them not to go through with it because they were being watched?
Were things that simple we'd just give you a list of targets, you would print it on the front page, and they would stop committing crimes. It does not work like that in the real world. However, I cannot tell you what it is we did.
Does the potential victim know their life was at risk?
Not always; however, they did in this case.
The central criminal police took great interest in the late Nikolai Tarankov; however, it did not prove possible to prevent his murder, even though I imagine surveillance activities were considerable.
We were not investigating Tarankov specifically.
Things connected to his close circle were investigated.
I can see your attempt at provocation. I cannot say even in hindsight whether we would have managed to prevent that murder or whether we should have anticipated it. Some things cannot be anticipated.