LONDON — The election of Jeremy Corbyn as leader of the Labour Party is an extraordinary choice in many respects — not least for the geopolitical signal it sends out.
You may have read that this hard-left maverick is unlikely to win a general election. You may also have heard that the Conservative Party, buoyed by its surprise victory in May, cannot believe that the principal opposition has chosen a new leader who will lead it even further into the wilderness.
All that is probably true. But it’s not the end of the story. Along the way, Mr. Corbyn has an unrivaled opportunity to change the terms of trade in foreign and security policy, to shatter consensus, to tear apart bipartisanship.
To understand what is happening, let’s go back to the beginning. The attacks of Sept. 11, 2001, were not only planned to maximize carnage and sow fear. They were also intended to provoke the West into a series of ferocious responses, not all of them considered or wise.
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