A Nexen oil sands facility seen from a helicopter near Fort McMurray, Alta., Tuesday, July 10, 2012. The Chinese National Offshore Oil Corp.'s bid to buy Calgary oil producer Nexen Inc. is posing a conundrum to Canada's governments and its people: what do we do when wealthy state-owned enterprises come calling? THE CANADIAN PRESS/Jeff McIntosh

Associated Press
A Nexen oil sands facility seen from a helicopter near Fort McMurray, Alta., Tuesday, July 10, 2012. The Chinese National Offshore Oil Corp.'s bid to buy Calgary oil producer Nexen Inc. is posing a conundrum to Canada's governments and its people: what do we do when wealthy state-owned enterprises come calling? THE CANADIAN PRESS/Jeff McIntosh
A Nexen oil sands facility seen from a helicopter near Fort McMurray, Alta., Tuesday, July 10, 2012. The Chinese National Offshore Oil Corp.'s bid to buy Calgary oil producer Nexen Inc. is posing a conundrum to Canada's governments and its people: what do we do when wealthy state-owned enterprises come calling? THE CANADIAN PRESS/Jeff McIntosh
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