[wsinks]

> "This is a concrete manifestation of the conflict between the FSB [Russia's internal intelligence service] / PMC [private military contractors, like the Wagner Group] on the one hand, and the Ministry of Defence / general staff of the Russian Federation on the other hand," he said.

> Did Mr Podolyak know something everyone else didn't? Or was he, perhaps, trolling Moscow, playing on extremely raw nerves exposed by Russia's recent setbacks on the battlefield in Ukraine?

The use of trolling here isn't to carefully a systematically search for an area of something. The use is much more akin to the internet's version of the word, which has the meaning of 'saying something meant to bring an extreme response from another targeted party'.

If there was a mention of investigators trolling the area for evidence of bomb vehicles, I'm with you, even though that feels like an uncommon usage in a BBC article. But this does feel different to me.