From an article in Japan Today:
"Dmitry Sablin, a lawmaker who coordinates parliamentary links with Syria, told the Interfax news agency the attack was even bigger than the Russian military acknowledged, involving 31 drones."
And in the comments section there re drone bomblets:
"Impovised explosive devices, 400 grams each, full of metal balls with effective killing range up to 50 meters. Ten such IEDs per drone."