Sanctions are intended to choke economies for decades. This week could be a sign that is heading for the mire. The intended effects of Western sanctions are already materialising. This week, the rouble, 's currency, collapsed around 40 per cent. The Moscow Stock Exchange has been shuttered since Monday. Concern about being effectively frozen out of the global economy has sparked bank runs across the country. However, for all the praise heaped on the UK, EU and US for swift action, their efforts could amount to nothing...