FEARS are growing that Vladimir Putin could twist the ISIS massacre in Moscow to execute 4,000 Ukrainian prisoners, an expert has warned. The deranged despot has already doubled down on claims Ukraine carried out the Crocus City Hall attack, raging that those behind the shooting "hoped to sow panic and discord" in Russia. 12 Russian tyrant Putin could use the attack to further his agenda against Ukraine, one expert has warned Credit: AP 12 Emergency workers dig through the rubble after Friday's attack Credit: AP 12 People place flowers at a makeshift memorial in front of the Crocus City Hall...