More than 130 killed, more than 140 injured – that is the grim toll of an attack by gunmen on the Crocus City Hall in the north-western suburbs of Moscow on Friday evening. Responsibility was quickly claimed by an Islamic State affiliate, with the United States endorsing that attribution as credible. The US also made it known that it had warned Russia, via some of the few channels still open between the two countries, of a pending terror attack, although Russia appeared not to have acted on the tip.
