In times of war, you need to strike where it hurts. So as Vladimir Putin continues to bombard Ukraine, the west has decided his Achilles heel is his hip pocket. Crippling economic sanctions have been imposed not just on Russia, but critically also the inner circle of multi-billionaire oligarchs who supposedly protect Putin's power. Their superyachts and mansions around the world have been seized, and their bank accounts frozen. It's a tactic that appears to be working, with the President's pals now doing the unthinkable and turning on him.