At least 40 people were killed and more than 100 were injured after armed attackers stormed a popular concert venue complex near Moscow and opened fire, according to preliminary information from the Federal Security Service in Russia, state media TASS reported.
It’s quite possible they did share, but the Russians thought they had it handled. Afaik there was a mirror situation in 2013 with the Boston bombings, Russian intelligence knew about the terrorists and tipped off the CIA but was largely disregarded.