The head of the Russian FSB accuses Ukraine and Western services of having facilitated the Moscow attack. This close friend of Vladimir Putin, however, assured that "the sponsor" ; had "not yet been identified" "Retaliatory measures will of course be implemented and this work is ongoing," Alexander Bortnikov warned on Tuesday.
Eleven people have been arrested by Russian law enforcement so far, including the four alleged attackers, all of whom have already been remanded in custody by a Moscow court, along with four other suspects.