What is ISIS-K, the group that claims it carried out the Moscow concert attack?ISIS-K is one of the most militant jihadist groups in the world, often mounting attacks against other Islamist groups, while also targeting Russia and the U.S.#news #npr #publicradio #usaposted by pod_feeder_v2 https://npr.org/2024/03/24/1240488528/isis-k-moscow-concert-attack-explainednpr.org