It took time for European Union leaders to agree on tough economic sanctions against Russia. The EU is slow. Its members have conflicting interests. Their economies don't all have the same exposure to Russia. Yet they have finally agreed with the United States on a list of measures to punish Russian banks and oil companies. The already weak EU economy will suffer in return. But over time, Europe will find that the sanctions were worth the pain.
Russian state-owned banks will be cut off from Western capital markets. The country's oil industry will not be able to access the foreign technology needed to drill in challenging territories like the Arctic. The travel of senior politicians and company executives close to the regime will be restricted, and they will fear for the money they have stashed abroad.
Even more important than the direct impact of the measures, Russia is becoming a pariah for investment and trade. It would take a brave and bold Western bank to, say, arrange a syndicated loan for a state-owned Russian company, even if that remains technically legal.
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If, on the other hand, Putin persists in his current policies, that will be a sure sign that Russia is headed for another time of troubles. Then the Western warning to investors to stay away from the country will look prescient.