Putin blamed the riot at the Makhachkala airport in Dagestan on the West. Which means the FSB was behind it, or Putin does not really object to it.
INFOGRAPHICS: Total combat losses of Russian Federation since beginning of war - about 299,940 people (+860 per day), 5,190 tanks, 7,202 artillery systems, 9,775 armored vehicles. Source: https://censor.net/en/n3452400