RUSSIA IS PLANNING for decades of Western sanctions, a senior foreign-ministry official, Dmitry Birichevsky, said last week. The evidence suggests that might not be too much of a problem. The economy is growing smartly, at an annualised rate of 4% in the second quarter, after a whopping 5.4% the quarter before, despite one of the toughest regimes ever imposed. Trade continues to flourish. How come?