Moscow alleges Ukraine and domestic opposition were behind the fatal bombing of a St Petersburg cafe. These experts aren't so sure

Darya Trepova has been charged with terrorism offences over the fatal bombing of a St Petersberg cafe. (AP: Alexander Zemlianichenko)

In the wake of the bombing death of Russian military blogger Vladlen Tatarsky in a St Petersburg cafe, Russian authorities have sought to implicate both Ukraine and the domestic opposition.

However, experts are sceptical of Moscow's narrative and say there are others with potential motives — including factions within the Russian establishment.