FinansFall of Lehman shows how unpredictable impact of Russian sanctions could beThe world should take lessons from 2008 and brace for a financial and economic shockPunishing Putin for his barbaric acts in Ukraine through stiff sanctions is necessary and more than justified on moral grounds. There is some recognition that there will be blowback for the rest of the world – higher petrol prices, for example, and further inflation in domestic energy costs.Foto: Alexei Druzhinin/AP/NTBPatrick Jenkins (FT)