"ISIS-K's Deadly Moscow Attack Raises Concerns About Group's Escalating Violence"
ISIS has demonstrated its capability to mount attacks in Russia, with a clear motive and intention to target the country. The ISIS-Khorasan branch, responsible for the recent Moscow concert attack, has been warned by U.S. officials for its potential to execute external operations against Western interests. ISIS-K has adopted a network-based system, allowing flexibility and the ability to fend off attacks. Despite the U.S. warning, Russia lacked actionable intelligence to implement effective security measures, highlighting the challenge of defending against terrorist attacks.