DOHA – The terrorist attack on the Crocus City Hall concert venue in a Moscow suburb was no bolt from the blue. The Kremlin dismissed U.S. intelligence warnings of an imminent attack by “extremists,” possibly to shift the blame to a convenient scapegoat when the attack came. The murder of 137 concert-goers is but the latest atrocity in a decade-long struggle between the Islamic State (ISIS) and Russia. The die was cast on Sept. 30, 2015, when Russia intervened in Syria to support the collapsing